WO2017038147A1

WO2017038147A1 - Method and device for manufacturing sheet-shaped member for absorbent article

Info

Publication number: WO2017038147A1
Application number: PCT/JP2016/061063
Authority: WO
Inventors: 竹内　賢治
Original assignee: ユニ・チャーム株式会社
Priority date: 2015-08-28
Filing date: 2016-04-05
Publication date: 2017-03-09
Also published as: BR112018003452B1; JP2017042468A; EA031592B1; CN107920927B; EP3342383A1; EP3342383A4; CN107920927A; BR112018003452A2; KR101896878B1; KR20180031076A; EA201800123A1; JP5990633B1

Abstract

Provided is a method for manufacturing a sheet-shaped member for an absorbent article by overlapping and fixing first and second sheets (3a, 5a) at a merging position (Pj). A first pitch is set in a continuing direction on the first sheet (3a). Before reaching the state of a sheet roll (5ar), marking elements (IL) are formed on the second sheet (5a) with a second pitch smaller than the first pitch. A sensor (31s) outputs a value according to a force applied to a central roll (31m) from the second sheet (5a) wound around three rolls (31u, 31m, 31d) at fixed positions on the upstream side of a device (51), and a device (21) unwinds the second sheet (5a) from the sheet roll (5ar) on the basis of the value. The device (51) conveys the second sheet (5a) to the merging position (Pj) while changing a stretched state of the second sheet (5a) such that the marking elements (IL) are arranged with the first pitch and the marking elements (IL) are positioned at target positions on the first sheet (5a) on the basis of the first pitch.

Description

Manufacturing method and manufacturing apparatus for sheet-like member according to absorbent article

The present invention relates to a method for manufacturing a sheet-like member and an apparatus for manufacturing absorbent articles such as disposable diapers.

As shown in the schematic side view of FIG. 1, in a disposable diaper production line LM ′ as an example of an absorbent article, a continuous first sheet 3 a ′ and a continuous second sheet 5 a ′ are overlapped and fixed. Thus, the sheet-like member 1a ′ is manufactured. Patent Document 1 discloses the following method as an example of a method for manufacturing the sheet-like member 1a '.

First, a predetermined product pitch P3 'is virtually set in the first sheet 3a' so as to correspond to each diaper in the continuous direction of the first sheet 3a '. In this example, at this point in time, the absorbers 4 ', 4',... Are fixed to the first sheet 3a 'at the product pitch P3' in the continuous direction. In this state, the first sheet 3a 'is conveyed by the conveying device 11' with the continuous direction as the conveying direction.

The second sheet 5a ′ is basically carried into the production line LM ′ in the state of the sheet roll 5ar ′, but before being wound into the state of the sheet roll 5ar ′, the second sheet 5a ′ is loaded on the sheet 5a ′. In the continuous direction, display elements (not shown) such as illustrations are formed at a printing pitch P5 ′ smaller than the product pitch P3 ′. When the delivery device 51 ′ sends out the second sheet 5a ′ fed from the sheet roll 5ar ′ by the feeding device 21 ′ of the production line LM ′ to the joining position Pj ′ in the transport path of the first sheet 3a ′. The delivery device 51 ′ has the display element placement target position on the first sheet 3 ′ determined based on the product pitch P3 ′ so that the display elements of the second sheet 5a ′ are arranged at the product pitch P3 ′. The extension state of the second sheet 5a ′ is changed so that the display elements are positioned, whereby the second sheet 5a ′ is in an appropriate arrangement state in which each display element corresponds to the product pitch P3 ′ of the first sheet 3a ′. The first sheet 3a ′ is overlaid and fixed.

On the other hand, in the manufacturing method of Patent Document 1, a so-called dancer roll DNC ′ is disposed at a position between the feeding device 21 ′ and the feeding device 51 ′ in the conveyance path of the second sheet 5a ′. And the tension | tensile_strength in conveyance of the said 2nd sheet | seat 5a 'is detected by winding this dancer roll DNC' around the 2nd sheet | seat 5a ', Based on this detection signal, feeding speed value of said feeding apparatus 21' Vunw ′ (m / sec) is controlled, whereby the tension of the second sheet 5a ′ is kept constant. Details are as follows.
For example, when the tension of the second sheet 5a ′ fluctuates and the tension becomes larger than the half value of the weight of the dancer roll DNC ′, the dancer roll DNC ′ is lifted up to the second sheet 5a ′ so that the dancer roll DNC ′ In this case, the feeding speed value Vunw ′ of the feeding device 21 ′ is increased so that the position of the dancer roll DNC ′ returns to the above-mentioned prescribed position, whereby the tension varies. Adjusted to previous value. On the other hand, when the tension fluctuates and the tension becomes less than half the weight of the dancer roll DNC ′, the dancer roll DNC ′ cannot support the weight of the dancer roll DNC ′ with the second sheet 5a ′. Is lowered from the specified position. In this case, the feeding speed value Vunw ′ of the feeding device 21 ′ is decreased so that the position of the dancer roll DNC ′ returns to the prescribed position. The tension is adjusted to the value before the change.

According to the configuration having the dancer roll DNC ′ having such a function, the fluctuation in the tension of the second sheet 5a ′ that can be caused by the change in the stretched state performed by the feeding device 51 ′ is moved upstream in the transport direction. , The fluctuation can be reduced based on the control of the feeding speed value Vunw ′. Therefore, the second sheet 5a 'in which the variation in tension is suppressed can be sent to the feeding device 51', which can also contribute to improving the accuracy of positioning the display element to the above-described arrangement target position.

Japanese Patent No. 4246020

However, as described above, the dancer roll DNC ′ detects a variation in the tension of the second sheet 5a ′ based on reciprocal movement in a predetermined direction. That is, the dancer roll DNC ′ translates in the reciprocating direction in accordance with the change in tension. Then, with this movement, the force due to the inertia of the dancer roll DNC ′ can act on the second sheet 5a ′, and as a result, a new fluctuation is caused in the tension of the second sheet 5a ′. There is a fear. For example, when the dancer roll DNC ′ in a stopped state starts to move, the force due to the inertia can act on the second sheet 5a ′ in the direction opposite to the moving direction, and thereby the second sheet 5a ′ In contrast, when the dancer roll DNC ′ in the moving state stops, the inertia-induced force can act on the second sheet 5a ′ in the moving direction, thereby There is a possibility that the tension of the two sheets 5a ′ may fluctuate.
As a result, the second sheet 5a ′ is sent to the feeding device 51 ′ in a state in which the variation in tension is not effectively suppressed, and this is the alignment to the above-described arrangement target position. The contribution to improving the accuracy can be reduced. In other words, the display elements of the second sheet 5a ′ are arranged with the product pitch P3 ′ and the like, and the display elements of the second sheet 5a ′ are placed at the display element arrangement target positions on the first sheet 3a ′ with high accuracy. Positioning may be hindered.

The present invention has been made in view of the conventional problems as described above, and the object thereof is to make display elements such as illustrations of the second sheet lined up at a first pitch such as a product pitch, and so on. The second sheet is placed on the first sheet and can be fixed with high accuracy so that the display element is positioned at the target position of the display element on the first sheet determined based on one pitch.

The main invention for achieving the above object is:
A method for producing a sheet-like member according to an absorbent article by stacking and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A feeding device that feeds the second sheet that is fed out and transported with the continuous direction as the transport direction, to a merging position of the transport path of the first sheet;
In the feeding, in the state where the second sheet is hung around three rolls rotatably supported at a fixed position upstream of the feeding device in the transport direction, The first sensor outputs a value corresponding to the force applied from the second sheet to the middle roll, and based on the value, the feeding device feeds the second sheet from the sheet roll. Perform the action
In the sending out, the display elements on the first sheet are determined so that the display elements of the second sheet conveyed in the conveyance direction are arranged at the first pitch and based on the first pitch. In the method for manufacturing a sheet-like member according to the absorbent article, the feeding device changes an extension state of the second sheet in the transport direction so that the display element is positioned at a target position.
Also,
An apparatus for manufacturing a sheet-like member according to an absorbent article by overlapping and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A delivery device for delivering the second sheet that is fed out and conveyed with the continuous direction as a conveyance direction, to a joining position of a conveyance path of the first sheet;
Three rolls rotatably supported at a fixed position between the feeding device and the feeding device in the transport direction;
In a state where the second sheet is wound around the three rolls, a first value is output according to the force applied from the second sheet to the middle roll of the three rolls. A sensor, and
The feeding device performs a feeding operation of the second sheet from the sheet roll based on the value,
The feeding device is configured to determine the first sheet so that the display elements of the second sheet conveyed in the conveying direction are arranged at the first pitch while feeding the second sheet and based on the first pitch. An apparatus for manufacturing a sheet-like member according to an absorbent article, wherein an extension state of the second sheet in the transport direction is changed so that the display element is positioned at a target position of the display element on the sheet It is.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, display elements such as illustrations of the second sheet are displayed at the arrangement target position of the display elements on the first sheet determined based on the first pitch so that the display elements are arranged at the first pitch such as the product pitch. The second sheet can be overlapped and fixed on the first sheet with high accuracy so that the element is positioned.

It is explanatory drawing of an example of the manufacturing method of the sheet-like member 1a 'concerning an absorbent article. 2A is a schematic plan view of the absorbent main body 1 viewed from the non-skin side, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2A. It is a schematic plan view of the continuous body 1a of the absorptive main body which becomes the origin of the absorptive main body 1. It is a schematic side view of the manufacturing line LM of the sheet-like member 1a of this embodiment. 2 is a schematic enlarged side view of a feeding device 21 and a tension measuring device 31. FIG. 6 is a schematic plan view of a continuous sheet 5a of a back sheet on which a plurality of illustrations IL, IL... Are printed in a continuous direction at a printing pitch P5 in another factory or the like. It is a schematic plan view of the backsheet continuous sheet 5a on which the illustration ILa is printed in a narrow range in one point. FIG. 8A is a schematic plan view of an upstream portion in the conveying direction in the processing system L5a of the continuous sheet 5a of the back sheet of the present embodiment, and FIG. 8B is an apparatus 21 in the upstream portion of the processing system L5a. 31 is a schematic plan view of an example in which the arrangement of 31 is different from the above-described embodiment. It is a schematic side view of the production line LM of the 1st modification of this embodiment. It is a schematic side view of the production line LM of the 2nd modification of this embodiment. It is a schematic side view of the production line LM of the 3rd modification of this embodiment. 12A to 12E are schematic side views for explaining the connection processing performed in the third modified example. It is explanatory drawing of two position Paj and Pajs which should be aligned in the case of a connection process. It is explanatory drawing of the method of implement | achieving said position alignment. It is a schematic plan view of a continuous sheet 5a of a back sheet on which different illustrations IL1 and IL2 are printed adjacent to each other at a printing pitch P5 in the continuous direction.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for producing a sheet-like member according to an absorbent article by stacking and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A feeding device that feeds the second sheet that is fed out and transported with the continuous direction as the transport direction, to a merging position of the transport path of the first sheet;
In the feeding, in the state where the second sheet is hung around three rolls rotatably supported at a fixed position upstream of the feeding device in the transport direction, The first sensor outputs a value corresponding to the force applied from the second sheet to the middle roll, and based on the value, the feeding device feeds the second sheet from the sheet roll. Perform the action
In the sending out, the display elements on the first sheet are determined so that the display elements of the second sheet conveyed in the conveyance direction are arranged at the first pitch and based on the first pitch. In the method for manufacturing a sheet-like member according to the absorbent article, the feeding device changes an extension state of the second sheet in the transport direction so that the display element is positioned at a target position.

According to the method for manufacturing a sheet-like member according to such an absorbent article, a value corresponding to the force applied from the second sheet to the middle roll among the three rolls is output from the first sensor. Is done. Based on the value, the feeding device performs the feeding operation of the second sheet from the sheet roll. This force is a force that increases and decreases in conjunction with the increase and decrease of the tension of the second sheet. It can be an indicator. Therefore, if the feeding operation is performed based on the value corresponding to the force as described above, the fluctuation in the tension of the second sheet that can be caused by the change in the extension state of the second sheet by the feeding device can be reduced. . And thereby, the 2nd sheet | seat in which the fluctuation | variation of tension | tensile_strength was suppressed can be sent to a sending-out apparatus.
Further, the above three rolls are supported at fixed positions, and these rolls hardly move except for rotation. That is, basically no translation is performed. Therefore, the above-mentioned problem that may occur when at least one of these rolls moves in translation, that is, a change in new tension occurs in the second sheet due to the inertial force of the roll accompanying the translation. As a result, the second sheet can be sent to the feeding device in a state in which the above-described tension variation is suppressed. As a result, the feeding device can change the extension state of the second sheet with high accuracy. As a result, in the above feeding, the feeding device is configured such that the display element of the second sheet has the first pitch. The second sheet can be superimposed and fixed on the first sheet with high accuracy so that the display element is positioned at the target position of the display element on the first sheet determined based on the first pitch. Become.

A method for producing a sheet-like member according to such an absorbent article,
The feeding device includes a rotation shaft portion, and a drive source that is connected to the rotation shaft portion and applies rotational force to the rotation shaft portion to drive and rotate the rotation shaft portion.
The rotary shaft is driven based on the value of the first sensor in a state where the rotary shaft is inserted into a through-hole in the center of the sheet roll and the sheet roll is supported by the rotary shaft. It is desirable that the feeding operation is performed by rotating.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the second sheet is fed out from the sheet roll by driving and rotating the rotating shaft portion inserted into the through hole in the central portion of the sheet roll. Therefore, for example, the belt member that rubs the outer peripheral surface of the sheet roll, that is, a problem that may occur when the second sheet is fed out from the sheet roll by driving the belt member that contacts the outer peripheral surface of the sheet roll. Thus, it is possible to reliably avoid problems such as wrinkling in the second sheet portion located on the outer peripheral surface or loosening of the portion. Thus, the feeding device can feed the second sheet toward the feeding device in a state in which wrinkles and slack are substantially suppressed, and this is also displayed on the arrangement target position performed by the feeding device described above. Contributes to improving the accuracy of element alignment.

A method for producing a sheet-like member according to such an absorbent article,
It is desirable that the feeding operation of the feeding device is performed so that a value related to the tension indicated by the value of the first sensor approaches a prescribed first target value.

According to the manufacturing method of the sheet-like member related to such an absorbent article, the feeding operation of the feeding device is performed so that the value relating to the tension indicated by the value of the first sensor approaches the prescribed first target value. Is done. Therefore, the fluctuation in the tension of the second sheet that can be caused by the change in the extension state of the second sheet by the feeding device can be reliably reduced by the feeding operation of the feeding device.

A method for producing a sheet-like member according to such an absorbent article,
The first sheet is so stretched in the conveying direction that the second sheet is at the middle roll position, rather than in the middle roll, after the stretching ratio of the second sheet has been changed by the feeding device. It is desirable that the target value is set.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the variation in stretchability of the second sheet in which the sheet roll can be contained can be reduced when the sheet roll is fed out. The extension state of the second sheet can be changed with high accuracy. Details are as follows. In general, when the second sheet is wound into a sheet roll state, the second sheet is wound while being stretched by applying tension in the continuous direction. In that case, from the viewpoint of improving the winding property. The tension value as the normal tension value is appropriately changed to a value suitable for the winding process, and as a result, the tension value is not constant. Therefore, in the state of the sheet roll, the extension state of the second sheet differs depending on each position in the continuous direction of the second sheet, and if the sheet is left for a while in such a different extension state, The stretchability of the sheet can vary. That is, the second sheet can be in a state having a portion that is easily stretchable and a portion that is difficult to stretch in the continuous direction.
And, when the stretched state of the second sheet is changed by the above-described feeding device while maintaining the variation in stretchability in this way, the variation is affected by the variation, and as a result, the stretched state There is a risk that changes cannot be made with high accuracy.
With regard to this point, in this manufacturing method, the expansion ratio of the second sheet at the position of the middle roll relating to feeding is larger than the expansion ratio of the second sheet after the expansion state is changed by the feeding device. Thus, the first target value is set. Therefore, in the above-described feeding, the second sheet can be extended so that the pitch of the display elements arranged on the second sheet fed from the sheet roll is larger than the first pitch. As a result, when the feeding device subsequently changes the extension state of the second sheet, the second sheet expands and contracts at least in the range until the pitch at which the display elements are arranged becomes the first pitch. The variation in sex is small. That is, the variation is in a smoothed state. Therefore, the feeding device can change the extended state in the conveyance direction of the second sheet in a state where the influence of the variation in stretchability is reduced, and thus the change can be performed with high accuracy.

A method for producing a sheet-like member according to such an absorbent article,
The second sheet is conveyed from the delivery device to the merging position along a predetermined direction in plan view,
In the arrangement position of the three rolls, the second sheet is conveyed along an intersecting direction intersecting the predetermined direction in a plan view,
The second sheet is wound around a rod-shaped member disposed at a position between the three rolls and the feeding device in the transport direction, so that the transport direction of the second sheet is changed from the intersecting direction. It is desirable to change in the predetermined direction.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the conveying direction of the second sheet can be changed from the intersecting direction to the predetermined direction in plan view by the rod-like member. Therefore, the three rolls can be arranged at a position deviating from the feeding device with respect to the crossing direction intersecting the predetermined direction connecting the feeding device and the joining position in plan view. And thereby, the full length dimension of the apparatus group provided to this manufacturing method can be shortened regarding the said predetermined direction, As a result, the said apparatus group can be made compact.
On the other hand, when the rod-shaped member having the function of changing the conveying direction is provided, the second sheet is caught by the rod-shaped member or the rod-shaped member when the variation of the tension of the second sheet occurs at the position of the rod-shaped member. Troubles are more likely to be induced, such as excessive sliding resistance. However, in this respect, according to this manufacturing method, as described above, the problem of the new tension fluctuation due to the inertial force of the three rolls is largely avoided, and the second sheet tension fluctuation is avoided. Is suppressed. Therefore, the above trouble induction can be effectively prevented.

A method for producing a sheet-like member according to such an absorbent article,
A tension adjusting device for adjusting the tension in the transport direction of the second sheet is disposed at a position between the three rolls and the feeding device in the transport direction,
The tension adjusting device includes three rolls rotatably supported at a fixed position, and a driving roll disposed upstream of the middle roll of the three rolls in the transport direction, The drive roll that rotates to drive the second sheet in contact with the second sheet and send the second sheet downstream in the transport direction;
A value corresponding to the force applied from the second sheet to the middle roll of the three rolls in a state where the second sheet is wound around the three rolls of the tension adjusting device. It is preferable that the tension in the transport direction of the second sheet is adjusted by driving and rotating the driving roll based on the value.

According to the manufacturing method of the sheet-like member related to such an absorbent article, the fluctuation in the tension of the second sheet that may be caused by the change in the extension state of the second sheet by the feeding device is reduced by the feeding operation of the feeding device. Prior to this, it can be reduced by the tension adjusting device. Therefore, the fluctuation in tension can be reduced more immediately, and as a result, the feeding device can change the extension state of the second sheet with higher accuracy.
Further, the above three rolls are supported at fixed positions, and these rolls hardly move except for rotation. That is, basically no translation is performed. Therefore, the above-mentioned problem that may occur when at least one of these rolls moves in translation, that is, a change in new tension occurs in the second sheet due to the inertial force of the roll accompanying the translation. As a result, the second sheet can be sent to the feeding device in a state in which the above-described tension variation is suppressed. Thereby, the feeding device can change the extension state of the second sheet with high accuracy.

A method for producing a sheet-like member according to such an absorbent article,
The arrangement position of the three rolls and the arrangement position of the driving roll of the tension adjusting device in the conveyance path of the second sheet are set to be more than the feeding position where the feeding device feeds the second sheet from the sheet roll. It is desirable that the apparatus is closer to the delivery position for delivering the second sheet.

According to the method for manufacturing a sheet-like member related to such an absorbent article, the above-described tension adjusting device can be disposed in the vicinity of the feeding device. Therefore, the fluctuation in the tension of the second sheet that can be caused by the change in the extension state of the second sheet by the feeding device can be reduced more immediately. As a result, the feeding device can reduce the extension state of the second sheet. Changes can be made with higher accuracy.

A method for producing a sheet-like member according to such an absorbent article,
The drive rotation of the drive roll is controlled such that the value relating to the tension indicated by the value of the second sensor approaches a prescribed second target value,
The extension magnification in the conveyance direction of the second sheet at the position of the middle roll of the tension adjusting device is the extension magnification in the conveyance direction of the second sheet at the position of the middle roll related to the feeding. In addition, it is preferable that the second target value is set so as to be smaller than both the expansion magnifications in the transport direction of the second sheet after the expansion state is changed by the feeding device.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the expansion ratio of the tension adjusting device is determined by the expansion ratio of the second sheet at the position of the middle roll and the feeding device. The expansion ratio of the second sheet after changing the expansion state is smaller than both. Therefore, in order to reduce the above-described variation in stretchability, the width shrinkage that can occur in the sheet when the sheet is conveyed to the feeding device while maintaining the large expansion ratio applied to the second sheet by the feeding device. And can prevent problems such as downpipe and folding. As a result, the feeding device can change the extension state of the second sheet with high accuracy. Incidentally, the “width shrinkage” referred to here is a phenomenon in which the dimension in the width direction intersecting the conveyance direction of the second sheet is excessively reduced, and is also referred to as “necking”. Further, the “longitudinal fold” is a ridge along the continuous direction as the conveyance direction, and the “folding” is that each end in the width direction of the second sheet is bent inward in the width direction. .

A method for producing a sheet-like member according to such an absorbent article,
The delivery device includes a delivery roll that rotates in contact with the second sheet so as to send the second sheet downstream in the transport direction, a detection sensor that detects a position of the display element and outputs a detection signal; And a controller for controlling the rotation operation of the delivery roll based on the detection signal,
When the detection signal indicates that the display element in the second sheet is shifted to the upstream side in the conveyance direction from the arrangement target position, the controller is configured based on the detection signal. While increasing the peripheral speed value of the delivery roll, the tension adjusting device is based on the amount of change in the direction of increasing the peripheral speed value based on the detection signal and the value output from the second sensor, Change the peripheral speed value of the drive roll,
When the detection signal indicates that the display element in the second sheet is shifted downstream in the transport direction from the arrangement target position, the controller is configured to cause the peripheral speed of the feed roll to The tension adjusting device reduces the value based on the detection signal based on the amount of change in the direction of decreasing the peripheral speed value and the value output from the second sensor. It is desirable to change the peripheral speed value.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the change in the peripheral speed value of the drive roll of the tension adjusting device is not only the value output from the second sensor of the tension adjusting device, This is performed in consideration of the change amount based on the detection signal output from the detection sensor by detecting the position of the display element. Therefore, before the influence of the change in the extension state by the feeding device goes back to the upstream side as the change in the tension of the second sheet and is detected by the second sensor of the tension adjusting device, the tension adjusting device The drive roll can be rotated so that the fluctuation of the tension becomes small. Therefore, it is possible to suppress the variation in the tension of the second sheet earlier.

A method for producing a sheet-like member according to such an absorbent article,
At least two feeding devices for feeding the second sheet from the sheet roll are provided;
A storage device capable of storing the second sheet in the form of a loop is disposed at a position between the feeding device and the feeding device in the transport direction,
In order to switch the feeding operation from one feeding device of the two feeding devices to the other feeding device, when the feeding operation of the second sheet by the one feeding device shifts to stop, When the storage device reduces the loop, the storage device supplies the second sheet to the feeding device, and the second sheet whose feeding operation in the one feeding device is stopped is changed to the other sheet. The other feeding device is connected to the second sheet of the sheet roll supported by the feeding device, and then the other feeding device starts the feeding operation of the second sheet from the sheet roll. The storage device stores the second sheet fed from the storage device by enlarging the loop. ,
The accumulator includes a plurality of fixed rollers arranged at fixed positions, a moving roller guided so as to be able to reciprocate in a direction in which the size of the loop of the second sheet can be changed with respect to the fixed rollers, An actuator that reciprocates the moving roller with the direction as the moving direction, and the loop is formed by the second sheet being wound around the fixed roller and the moving roller,
By moving the moving roller in the direction in which the moving roller approaches the fixed roller, the loop is reduced, and the accumulated second sheet is supplied to the feeding device,
The actuator moves the moving roller in a direction in which the moving roller moves away from the fixed roller, whereby the loop is enlarged to a predetermined length, and the second sheet is accumulated.
It is desirable that a period during which the actuator holds the moving roller is included so that the moving roller does not move from a predetermined position in the moving direction until the next switching of the feeding operation.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the moving roller is kept at the same position so as not to move from a predetermined position in the moving direction during the period until the next feeding operation is switched. Is held by an actuator. Therefore, during the period, it is possible to effectively suppress fluctuations in the tension of the second sheet that may be caused by the force caused by the inertia of the moving roller when the moving roller moves.

A method for producing a sheet-like member according to such an absorbent article,
When the loop is made small, it is desirable that the actuator is controlled so that the value relating to the tension indicated by the value of the first sensor approaches a prescribed third target value.

According to the manufacturing method of the sheet-like member related to such an absorbent article, it is possible to suppress the variation in the tension of the second sheet that may occur when the loop is reduced, and thereby the second sheet Can be sent to the delivery device in a state in which fluctuations in the number are suppressed.

A method for producing a sheet-like member according to such an absorbent article,
When the actuator moves the moving roller to a position corresponding to the specified length in order to enlarge the loop, a value related to the tension indicated by the value of the first sensor is a specified fourth value. It is desirable that the feeding operation of the other feeding device is performed so as to approach the target value.

According to the manufacturing method of the sheet-like member related to such an absorbent article, it is possible to suppress the fluctuation in the tension of the second sheet that may occur when the loop is enlarged, and thereby the second sheet Can be sent to the delivery device in a state in which fluctuations in the number are suppressed.

A method for producing a sheet-like member according to such an absorbent article,
In the case of reducing the loop, the actuator moves the moving roller in the direction by applying a force in the moving direction to the moving roller in a direction in which the loop is reduced.
When enlarging the loop, it is preferable that the actuator moves the moving roller in the direction by applying a force in the moving direction to the moving roller in a direction in which the loop becomes larger.

According to the method for manufacturing a sheet-like member according to such an absorbent article, the actuator can receive and bear the force due to the inertia of the moving roller in both cases where the loop is made small and large, Thereby, it can prevent that the force resulting from the said inertia acts on a 2nd sheet | seat. As a result, it is possible to effectively prevent a new variation in tension from occurring in the second sheet due to the force, and thereby the second sheet is in a state in which the variation in tension is suppressed as described above. Can be reliably sent to the delivery device.

A method for producing a sheet-like member according to such an absorbent article,
At least two feeding devices for feeding the second sheet from the sheet roll are provided,
When switching the feeding operation from one feeding device of the two feeding devices to the other feeding device, up to the same value as the feeding speed value of the second sheet in the one feeding device, the other After detecting that the peripheral speed value of the sheet roll supported by the feeding device is accelerated, the second sheet fed from the one feeding device is moved to the second roll of the sheet roll supported by the other feeding device. It is desirable to connect the second sheet.

According to the manufacturing method of the sheet-like member related to such an absorbent article, it is detected that the peripheral speed value of the sheet roll of the other feeding device has been accelerated to the feeding speed value of the second sheet in the one feeding device. After that, the second sheet of the sheet roll supported by the other feeding device is connected to the second sheet fed from the one feeding device. Therefore, when switching from one feeding device to the other feeding device, it is not necessary to stop the feeding operation of the one feeding device. As a result, the storage device for the second sheet, which has become an essential configuration due to this stoppage, can be omitted, and as a result, the configuration of the apparatus can be simplified.

A method for producing a sheet-like member according to such an absorbent article,
When switching the feeding operation from the one feeding device to the other feeding device,
A position corresponding to the predetermined position in the display element of the second sheet of the sheet roll supported by the other feeding device and a predetermined position of the second sheet fed out by the one feeding device. The second sheet fed by the one feeding device is aligned with the second sheet while the positioning is performed so that the amount of deviation in the conveying direction between the two is within ± 5% of the second pitch of the display element. It is desirable to connect the second sheet of the sheet roll supported by the feeding device.

According to the manufacturing method of the sheet-like member related to such an absorbent article, the second sheet fed out by one feeding device and the second sheet of the sheet roll supported by the other feeding device are mutually The display elements are connected with a positional accuracy such that the shift amount of the display element in the transport direction is within ± 5% of the second pitch. Therefore, the continuity of the second sheet in the switching of the feeding operation is almost guaranteed for the arrangement state of the display elements. This eliminates an excessive change in the stretched state that may need to be performed by the feeding device when the discontinuity of the display element arrangement state is large. This contributes effectively to changing the stretched state with high accuracy.

Also,
An apparatus for manufacturing a sheet-like member according to an absorbent article by overlapping and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A delivery device for delivering the second sheet that is fed out and conveyed with the continuous direction as a conveyance direction, to a joining position of a conveyance path of the first sheet;
Three rolls rotatably supported at a fixed position between the feeding device and the feeding device in the transport direction;
In a state where the second sheet is wound around the three rolls, a first value is output according to the force applied from the second sheet to the middle roll of the three rolls. A sensor, and
The feeding device performs a feeding operation of the second sheet from the sheet roll based on the value,
The feeding device is configured to determine the first sheet so that the display elements of the second sheet conveyed in the conveying direction are arranged at the first pitch while feeding the second sheet and based on the first pitch. An apparatus for manufacturing a sheet-like member according to an absorbent article, wherein an extension state of the second sheet in the transport direction is changed so that the display element is positioned at a target position of the display element on the sheet It is.

According to the sheet-like member manufacturing apparatus relating to such an absorbent article, the same effects as those of the manufacturing method described above can be achieved.

=== This Embodiment ===
In the manufacturing method of the sheet-like member of this embodiment, the continuous body 1a of the absorptive main body of a disposable diaper is manufactured as an example of the said sheet-like member. And the manufactured continuous body 1a of the absorbent main body is sent to the cutter device 80 (see FIG. 4) in the lower process, and is cut at the product pitch P3 in the transport direction by the cutter device 80. Absorbent body 1 is produced.

FIG. 2A is a schematic plan view of the absorbent main body 1 viewed from the non-skin side, and FIG. 2B is a cross-sectional view taken along line BB in FIG. 2A. The absorbent main body 1 is a sheet-like member having a substantially rectangular shape in plan view having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other. The absorbent body 4 that absorbs liquid and the absorbent body 4 in the thickness direction. The top sheet 3 is disposed so as to cover from the skin side, and the back sheet 5 is disposed so as to cover the absorber 4 from the non-skin side in the thickness direction. And when the planar view substantially hourglass-shaped exterior sheet | seat (not shown) etc. which make the exterior of a diaper are laminated | stacked and fixed to this absorptive main body 1, a diaper will be almost completed.

The absorbent body 4 includes an absorbent core 4c formed by molding a liquid absorbent material such as pulp fiber or superabsorbent polymer (so-called SAP) into a predetermined shape such as a substantially hourglass shape in plan view, and an outer surface of the core 4c. And a liquid-permeable core wrap sheet (not shown) such as a tissue paper covering the entire surface. The core wrap sheet may be omitted.

The top sheet 3 is a liquid-permeable sheet having a larger planar size than the absorber 4. And as a raw material, an air through nonwoven fabric etc. can be illustrated and this is used here, However, if it is a liquid-permeable sheet, it will not be restricted to this at all.

The back sheet 5 is also a sheet having a larger planar size than the absorber 4, but is a liquid-impermeable sheet. Therefore, examples of the material include resin films such as polyethylene (PE) and polypropylene (PP). Here, PE film is used, but it is a liquid-impermeable sheet and is predetermined. If it has the elasticity of this, it will not be restricted to this at all.

As shown in FIG. 2A, a flower illustration IL is printed on the non-skin side surface of the back sheet 5 as an example of a display element. Specifically, the illustration IL has a plurality of floral patterns G, G..., And a plurality of the symbols G, G. As a result, the illustration IL is printed over substantially the entire surface of the backsheet 5. It should be noted that the illustration IL is printed over substantially the entire surface in this way, because the accuracy of the alignment of the illustration IL with respect to the continuous sheet 3a of the top sheet formed in the production line LM of the continuous body 1a of the absorbent main body to be described later. This will be described later. Examples of the illustration IL printing method include gravure printing, flexographic printing, and inkjet printing.

FIG. 3 is a schematic plan view of a continuous body 1 a of the absorbent main body that is the basis of such an absorbent main body 1. The continuous body 1a of an absorptive main body has a plurality of absorptive

main bodies

1, 1... Continuous in the longitudinal direction. Specifically, the continuum 1a has a top sheet continuous sheet 3a (corresponding to a first sheet) in which a plurality of

top sheets

3, 3... Are continuous in the longitudinal direction, and a plurality of

back sheets

5, 5. The continuous sheet 5a (corresponding to the second sheet) of the back sheet that is continuous in the direction and the

continuous sheet

3a, 5a are arranged side by side with the product pitch P3 (corresponding to the first pitch) in the longitudinal direction. .., And each of the

members

3a, 5a, 4 is joined to an adjacent member by a hot melt adhesive or the like.

Such a continuous body 1a of the absorbent main body is manufactured by the manufacturing line LM shown in the schematic side view of FIG. The production line LM includes a processing system L3a for the continuous sheet 3a for the top sheet and a processing system L5a for the continuous sheet 5a for the back sheet. The processing system L5a of the continuous sheet 5a of the back sheet joins the processing system L3a of the continuous sheet 3a of the top sheet at the joining position Pj of the same system L3a.

In this production line LM, a CD direction (a direction penetrating the paper surface in FIG. 4) is set as the width direction of the line LM. In this example, the CD direction is in the horizontal direction, but the present invention is not limited to this. Further, in this example, a vertical vertical direction and a horizontal front-rear direction are set as two directions orthogonal to the CD direction, whereby the conveying direction of the

continuous sheets

3a, 5a of the top sheet and the back sheet is Each of them faces the direction defined by both the up-down direction and the front-rear direction according to the position in the transport direction. The width direction of each of the

continuous sheets

3a and 5a of the top sheet and the back sheet is parallel to the CD direction. Further, when the direction perpendicular to the CD direction and the conveyance direction is defined as the Z direction, the Z direction is parallel to the thickness direction of the

continuous sheets

3a and 5a of the top sheet and the back sheet, respectively.

<<< Processing System L3a for Continuous Sheet 3a of Top Sheet >>>
The processing system L3a for the continuous sheet 3a of the top sheet includes a transport device 11 that transports the continuous sheet 3a of the top sheet along the transport direction, and a joining device 15 that is arranged corresponding to the merging position Pj. . Here, at the time of being conveyed by the conveying device 11, the

absorbers

4, 4,... Are already fixed to the continuous sheet 3a of the top sheet at the product pitch P3 in the conveying direction. In addition, this transport operation is performed based on the synchronization signal. The synchronization signal is a signal obtained by repeatedly outputting a unit signal corresponding to each conveying operation of the product pitch P3. In this example, the unit signal is a rotation composed of rotation angle values of 0 ° to 360 °. An angle signal is output. Then, such a synchronization signal is transmitted to an amplifier (not shown) of a servo motor (not shown) serving as a drive source for the transport device 11. Therefore, every time the unit signal is output, the transport device 11 transports the continuous sheet 3a of the top sheet by the product pitch P3 in the transport direction.

Examples of the transport device 11 include a belt conveyor and a transport roller. Here, a belt conveyor is mainly used. As an example of the belt conveyor, a normal belt conveyor having an endless belt that circulates as a transport surface, a suction belt conveyor having an adsorption function on the outer peripheral surface of the endless belt, and the like can be given.

Further, the generation of the synchronization signal can be performed by, for example, the cutter device 80 that generates the absorbent main body 1 by dividing the continuous body 1a of the absorbent main body at the product pitch P3 in the transport direction. That is, the cutter device 80 includes a cutter roll 81c that has a cutter blade 82 on the outer peripheral surface and rotates along the transport direction, and an anvil roll 81a that rotates along the transport direction while receiving the cutter blade 82 on the outer peripheral surface. However, a rotary encoder (not shown) is provided at one end of the cutter roll 81c in the CD direction as an example of a rotation detector that detects the rotation operation of the cutter roll 81c. The encoder outputs the unit signal each time the cutter blade 82 rotates by the product pitch P3 in conjunction with the rotation operation of the cutter roll 81c.

The joining device 15 has, for example, a pair of upper and

lower belt conveyors

15u and 15d. Between the pair of upper and

lower belt conveyors

15u and 15d, a conveyance path for the continuous sheet 3a of the top sheet to which the absorber 4 is fixed is formed. Further, the above-mentioned joining position Pj is set at a position upstream of the conveyance path, and the continuous sheet 5a of the back sheet is fed from the processing system L5a of the continuous sheet 5a of the back sheet at the joining position Pj. To do. And while both

sheets

3a and 5a move along the conveyance path of the pair of

belt conveyors

15u and 15d in a state where the continuous sheet 3a of the top sheet and the continuous sheet 5a of the back sheet are overlapped in the thickness direction, Both the

sheets

3a and 5a are sandwiched between the pair of

belt conveyors

15u and 15d in the thickness direction, and are thereby firmly joined to each other in a superposed state with a hot melt adhesive or the like.

The conveying operation of the pair of

belt conveyors

15u and 15d constituting the joining device 15 is also performed based on the above-described synchronization signal. That is, every time a unit signal of the synchronization signal is output, the

belt conveyor

15u, 15d conveys the continuous sheet 3a of the top sheet and the continuous sheet 5a of the back sheet by the product pitch P3 in the conveying direction.

<<< Processing System L5a of Backsheet Continuous Sheet 5a >>>
On the other hand, the processing system L5a for the continuous sheet 5a of the back sheet is the same as the feeding device 21 for feeding the continuous sheet 5a of the back sheet from the sheet roll 5ar while conveying the continuous sheet 5a of the fed back sheet in the conveying direction. A tension measuring device 31 that measures the tension in the conveyance direction of the continuous sheet 5a, and a sending device that sends the continuous sheet 5a of the back sheet that has passed through the tension measuring device 31 to the joining position Pj of the processing system L3a of the continuous sheet 3a of the top sheet. 51. Then, at the joining position Pj, as described above, the continuous sheet 5a of the back sheet and the continuous sheet 3a of the top sheet are overlapped and fixed by the joining device 15 described above. A continuum 1a is generated.

Here, before the continuous sheet 5a of the back sheet is wound in the continuous direction to be in the state of the sheet roll 5ar, the continuous sheet 5a of the back sheet is preliminarily used in another factory or the like. The above-described illustrations IL, IL... Are printed in a continuous direction at a predetermined printing pitch P5 (corresponding to the second pitch) (see FIG. 6). The printing pitch P5 is smaller than the product pitch P3 set for the continuous sheet 3a of the top sheet. Therefore, in the above-described joining device 15 at the joining position Pj, basically, the backsheet continuous sheet 5a is stretched at the stretching magnification Ms (= P3 / P5) obtained by dividing the product pitch P3 by the printing pitch P5. Thus, the continuous sheet 5a is overlaid and fixed on the continuous sheet 3a of the top sheet, whereby the illustration IL is arranged at an appropriate position in the continuous sheet 3a of the top sheet as shown in FIG.
By the way, the expansion magnification referred to here is the number of times the total length Lt in the continuous direction (conveying direction) of the continuous sheet 5a in the expanded state is the natural length Ln before extension (the length when no external force is acting). For example, it can be obtained as a division value (= Lt / Ln) obtained by dividing the total length Lt in the expanded state by the natural length Ln.
In this example, for example, when the printing pitch P5 is set to “1”, the product pitch P3 is set to “1.026”, whereby the expansion ratio of the continuous sheet 5a of the back sheet in the joining device 15 is set. Ms is 1.026 times. And since the expansion | extension to this expansion magnification Ms is made between the sending-out apparatus 31 and the joining apparatus 15, the said expansion magnification Ms can also be called the expansion magnification Ms in the joining apparatus 15 as mentioned above. Alternatively, it can also be referred to as the expansion magnification Ms in the delivery device 51.
Hereinafter, each

device

21, 31, 51 related to the processing system L5a of the backsheet continuous sheet 5a will be described.

(1) Feeding device 21
As shown in the schematic enlarged side view of FIG. 5, the feeding device 21 is connected to the rotation shaft portion 21 a and the rotation shaft portion 21 a, and applies rotational force to the rotation shaft portion 21 a to drive the rotation shaft portion 21 a. A drive source (not shown) that rotates and a controller 21c that controls the drive source based on a tension value output from the tension measuring device 31 are provided. And in the state which inserted the said rotating shaft part 21a in the through-hole which the sheet roll 5ar has in the center part, and supported the sheet roll 5ar by the said rotating shaft part 21a, the said rotating shaft part 21a is based on said tension value. By driving and rotating, the continuous sheet 5a of the back sheet is fed out from the sheet roll 5ar.
The rotating shaft portion 21a is a shaft member along the CD direction, for example. The rotating shaft portion 21a is rotatably supported by an appropriate bearing member (not shown) provided in the production line LM.

The drive source is, for example, a servo motor. In this example, a direct drive method is employed as a connection method between the servo motor and the rotating shaft portion 21a. That is, the drive rotation shaft portion (not shown) of the servo motor and the rotation shaft portion 21a are coaxially connected to each other by an appropriate shaft coupling (not shown). Thus, the rotational force is directly input to the rotary shaft portion 21a from the drive rotary shaft portion that rotates based on the electric power supplied to the servomotor. Therefore, the feeding operation can be performed with high responsiveness without problems such as backlash. However, it is not limited to this. That is, if there is no problem even if this responsiveness is somewhat low, for example, via a plurality of gears or timing belts inserted between the drive rotating shaft portion of the servo motor and the rotating shaft portion 21a. The rotational force of the drive rotary shaft portion may be transmitted to the rotary shaft portion 21a.

The controller 21c is an appropriate computer such as a PLC (programmable logic controller) or a sequencer, and includes a processor and a memory. Then, the processor reads out and executes the program stored in the memory, thereby controlling the feeding operation of the rotating shaft portion 21a. In other words, the rotary shaft portion so that the tension value (N) output from the tension measuring device 31 (corresponding to “a value related to tension”) is aligned with a prescribed tension target value (corresponding to “first target value”). The feeding speed value Vunw (m / sec) of 21a is controlled.

More specifically, such control is performed, for example, by repeatedly performing the following processing at a predetermined control cycle. First, the amount of deviation of the tension value from the tension target value is obtained by subtracting the former from the latter. Next, the control amount is calculated by multiplying the deviation amount by a predetermined control gain, and the control amount is added to the command value of the current feeding speed value Vunw (m / sec) to obtain a new command value. . And the rotating shaft part 21a is rotated by this new command value. Therefore, when the tension value is larger than the tension target value, the feeding speed value Vunw (m / sec) is made larger by the absolute value of the control amount than the current value, and thereby the tension value becomes the tension target value. When the tension value is smaller than the target tension value, the feeding speed value Vunw (m / sec) is made smaller by the absolute value of the control amount than the current value, and the tension value is thereby reduced. The value increases to approach the tension target value.

Then, if the feeding speed value Vunw is changed so that the tension value is aligned with the tension target value in this way, the feeding device 51 of FIG. 4 located downstream in the conveying direction temporarily changes the back sheet continuous sheet 5a. Even when the tension of the sheet 5a fluctuates when the extension state is changed, and this fluctuation goes back to the upstream side in the conveyance direction, the fluctuation can be reduced by changing the feeding speed value Vunw. Thus, the feeding device 21 can send the continuous sheet 5a of the back sheet in which the fluctuation of the tension is suppressed to the feeding device 51. As a result, the feeding device 51 extends the continuous sheet 5a of the back sheet. The state can be changed with high accuracy.
Incidentally, the above-described feeding speed value Vunw (m / second) is, for example, the peripheral speed value (m / second) of the outer peripheral surface of the sheet roll 5ar. This is the peripheral speed value (m / sec) of the outer peripheral surface of the sheet roll 5ar at the position where the sheet 5a is separated (corresponding to the feeding position).

By the way, the tension target value is set to a value corresponding to the expansion magnification Munw to be expanded by the feeding device 21. That is, the target tension value is obtained by measuring the load-displacement curve of the continuous sheet 5a of the back sheet in advance, and is obtained from the load value corresponding to the displacement corresponding to the expansion magnification Munw and set to the load value. Yes. Further, here, the value of the expansion ratio Munw is set to be larger than the expansion ratio Ms of the continuous sheet 5a of the back sheet after the expansion state is changed by the feeding device 51 of FIG. For example, in this example, the expansion magnification Munw is set to 1.05 times, which is larger than 1.026 times the expansion magnification Ms in the above-described delivery device 31.
Therefore, in the feeding device 21, the backsheet is previously placed so that the illustrations IL, IL,... Are arranged in the transport direction on the continuous sheet 5a of the backsheet fed from the sheet roll 5ar to be larger than the product pitch P3. The continuous sheet 5a is extended. Thus, when the feeding device 51 subsequently changes the extension state of the continuous sheet 5a of the back sheet, the range until at least the above-described illustrations IL, IL,... In this case, the variation in stretchability of the continuous sheet 5a of the back sheet can be reduced. That is, the variation can be smoothed. Therefore, the feeding device 51 can change the stretched state of the continuous sheet 5a in the conveyance direction in a state where the influence of the variation in stretchability is reduced. This also changes the stretched state with high accuracy. Contributes effectively to doing.

In the example of FIG. 4, the expansion ratio Munw given by the feeding device 21 is 1.05, whereas the backsheet continuous sheet 5 a on which the illustration IL is printed at another factory is the sheet. The stretching magnification Mw applied to the sheet 5a when winding the roll 5ar is set to a range of 1.005 to 1.03 times smaller than that. That is, the expansion magnification Munw when expanding by the feeding device 21 is larger than the expansion magnification Mw for winding.
Therefore, the variation in stretchability of the continuous sheet 5a of the back sheet that may be caused by being wound in the state of the sheet roll 5ar while being stretched at the stretching magnification Mw for winding is left in the feeding device 21. Leveling can be ensured by a large extension. As a result, the delivery device 51 can change the extension state of the back sheet 5a with high accuracy when sending the continuous sheet 5a of the back sheet to the joining position Pj.

Further, as described above with reference to FIG. 2A, the illustration IL is printed on substantially the entire surface of the non-skin side surface of the single-sheet back sheet 5. That is, in the state of the continuous sheet 5a of the back sheet in FIG. 6, when the area A5 corresponding to the printing pitch P5 is equally divided into four areas A5p, A5p,. These four regions A5p, A5p... Are present in all regions A5p, A5p.
Accordingly, as shown in FIG. 7, the variation in stretchability of the continuous sheet 5a that may occur due to the presence of the illustration IL in the example of FIG. 6 as compared to the case where the illustration ILa exists in a narrow range in one point. Can be leveled. This also contributes to the feeding device 51 effectively changing the extension state of the continuous sheet 5a of the back sheet with high accuracy.

(2) Tension measuring device 31
As shown in FIG. 4, first, the tension measuring device 31 includes three parallel-supported units that are rotatably supported at fixed positions downstream of the feeding device 21 in the conveying direction and upstream of the feeding device 21 in the conveying direction. The apparatus 31 includes three

rolls

31u, 31m, and 31d, and the three

rolls

31u, 31m, and 31d are wound around the three continuous rolls 5a in a chevron shape. The first sensor 31s (FIG. 5) that outputs in real time a value corresponding to the force F5a (FIG. 5) applied from the continuous sheet 5a of the back sheet to the middle roll 31m of the

rolls

31u, 31m, 31d. Furthermore, the apparatus 31 has a converter 31k that converts the value output from the first sensor 31s into a tension value.

Each of the three

rolls

31u, 31m, and 31d is supported so as to be rotatable around a rotation axis along the CD direction. That is, as shown in FIG. 5, bearing members Brg are provided at the end portions in the CD direction of the

respective rolls

31u, 31m, 31d so as not to move to the fixed positions of the production line LM. 31u, 31m, and 31d are supported at both ends by the bearing member Brg so that they can rotate but cannot translate. Each of the bearing members Brg of the middle roll 31m among the three

rolls

31u, 31m, and 31d is provided with a strain gauge 31s as an example of the first sensor 31s. 31s outputs the value according to the force F5a provided to the said roll 31m from the continuous sheet 5a of a back sheet in real time. That is, a value corresponding to the force F5a facing the radial direction of the roll 31m acting on the roll 31m is output in real time. The force F5a is a force that increases and decreases in conjunction with increase and decrease of the tension of the continuous sheet 5a of the back sheet. Therefore, it is a force that can be an alternative index of the tension, that is, a tension value that is a tension value can be calculated from the above value. Therefore, the output value from the strain gauge 31s is input to the converter 31k, and is converted into the tension value of the continuous sheet 5a of the back sheet by being multiplied by an appropriate coefficient or the like in the converter 31k. The Then, the tension value is inputted in real time to the controller 21c of the feeding device 21 described above, whereby the controller 21c calculates the amount of deviation between the tension value and the tension target value. 21 is used to control the feeding speed value Vunw.

Further, these three

rolls

31u, 31m, and 31d are supported at fixed positions as described above, and thus hardly move except for rotation. That is, basically no translation is performed. Therefore, the above-described problem that may occur when at least one of the

rolls

31u, 31m, and 31d is translated, that is, the continuous sheet 5a of the back sheet due to the inertial force of the roll accompanying the translational movement. Therefore, it is possible to substantially avoid the problem of new fluctuations in tension, and as a result, the continuous sheet 5a can be sent to the feeding device 51 with the fluctuations suppressed. As a result, the delivery device 51 can change the extension state of the continuous sheet 5a with high accuracy. As a result, the delivery device 51 conveys the illustrations IL, IL, ... of the continuous sheet 5a. Back sheet with high accuracy so that each illustration IL is positioned at the target position of illustrations IL, IL,... On top sheet continuous sheet 3a determined based on product pitch P3 so as to be lined up with product pitch P3 in the direction. The continuous sheet 5a can be fixed by being superimposed on the continuous sheet 3a of the top sheet.

In this example, as shown in FIG. 5, the continuous sheet 5a of the back sheet that is wound around the three

rolls

31u, 31m, and 31d has a mountain shape protruding upward. Not exclusively. That is, the three

rolls

31u, 31m, and 31d may be arranged so that the continuous sheet 5a has a valley shape protruding downward.

(3) Delivery device 51
As shown in FIG. 4, the sending-out device 51 sends the continuous sheet 5a of the back sheet to the joining position Pj to the processing system L3a of the continuous sheet 3a of the top sheet. When the sheet is sent out, the extension state in the conveying direction of the continuous sheet 5a of the back sheet is appropriately changed so that the illustration IL of the continuous sheet 5a of the back sheet is arranged at the above-described product pitch P3, and The illustration IL is positioned at the arrangement target position of the illustration IL on the continuous sheet 3a of the top sheet determined based on the product pitch P3.

The delivery device 51 includes, for example, a pair of nip rolls 52a and 52b as an example of a delivery roll, a controller 55 that controls the rotational operation of the pair of nip rolls 52a and 52b, and the position of the illustration IL of the continuous sheet 5a of the back sheet. And a detection sensor 57 for detection.

The pair of nip rolls 52a and 52b are supported so as to be rotatable about rotation axes C52a and C52b along the CD direction, respectively. Each of the

rolls

52a and 52b obtains a driving rotational force from a servo motor (not shown) as a driving source and rotates while sandwiching the continuous sheet 5a of the back sheet, whereby the continuous sheet 5a is moved to the joining position Pj. To send to.

The controller 55 is an appropriate computer such as a PLC or a sequencer. Then, by controlling the rotation operation of the nip rolls 52a and 52b based on the detection signal of the illustration IL output from the detection sensor 57, the continuous sheet 5a of the back sheet between the nip rolls 52a and 52b and the joining device 15 is extended. Change state.

The detection sensor 57 includes, for example, an imaging device 57c and an image processing device 57ip that performs image processing on image data transmitted from the imaging device 57c. The imaging device 57c includes, for example, a CCD camera, a processor, and a memory. The camera images, for example, the continuous sheet 5a of the back sheet that is moving on the conveyance path between the nip rolls 52a and 52b and the joining device 15. .

The imaging operation is performed based on the aforementioned synchronization signal. That is, when the imaging device 57c receives the synchronization signal at all times and detects that the rotation angle value of the synchronization signal matches the prescribed rotation angle value stored in advance in the memory of the imaging device 57c, The imaging device 57c performs an imaging operation. The prescribed rotation angle value is set, for example, to such a value that the illustration IL fits in the image indicated by the image data. Then, every time the rotation angle value of the synchronization signal matches the specified rotation angle value, the imaging device 57c repeats the imaging operation. Therefore, in this example, an imaging operation is performed for each illustration IL to generate image data. Each time new image data is generated, the new image data is transmitted to the image processing device 57ip.

The image processing device 57ip has an appropriate computer as a main body and includes a processor and a memory. The image processing device 57ip performs binarization processing as an example of image processing based on the transmitted image data each time image data is transmitted from the imaging device 57c. Then, by binarization processing, the pixel of the imaging portion of the illustration IL in the image of the image data is extracted to obtain the position coordinate of the pixel. Details are as follows.
First, an image of image data is composed of a plurality of pixels arranged two-dimensionally in both the X direction and the Y direction. The images are taken with the CD direction as the X direction and the transport direction as the Y direction, for example. The image data has color information corresponding to each pixel. In this example, since the image data is grayscale, each pixel has only brightness as color information. Further, the brightness of the pixel indicating the illustration IL is lower than the brightness of the pixel indicating the continuous sheet 5a of the back sheet. Therefore, if a binarization process is performed in which pixels having a lightness equal to or higher than a predetermined threshold are assigned to a white image and pixels having a lightness less than the threshold are assigned to a black image, the imaging portion of the illustration IL in the image is extracted as a black image. Can do. If the imaging part of the illustration IL is extracted as a black image, the arithmetic average value of the position coordinates of all the pixels constituting the black image is represented by the position coordinate of the pixel of the imaging part of the illustration IL. Can be used as position coordinates.

Meanwhile, position coordinate data for comparison is stored in advance in the memory of the image processing device 57ip. Here, the position coordinates for comparison are the pixels of the illustration IL in the image when the illustration IL is correctly arranged at the arrangement target position defined on the continuous sheet 3a of the top sheet at the merging position Pj. Indicates the position coordinates to be located. In addition, the Y coordinate among the position coordinates indicates the coordinate in the transport direction.

Accordingly, by subtracting the Y coordinate value of the pixel position coordinate of the imaging portion of the illustration IL obtained by extraction from the binarization process from the Y coordinate value of the comparative position coordinate, the image processing apparatus 57ip can calculate the amount of deviation of the illustration IL in the transport direction. Each time the deviation amount is calculated, the calculated deviation amount data is transmitted to the controller 55 as the detection signal.

Then, the controller 55 controls the rotation operation of the nip rolls 52a and 52b based on the data. For example, the change amount ΔV is calculated by multiplying the deviation amount indicated by this data by a specified gain, and the change amount ΔV is added to the command value of the current peripheral speed value (m / sec) to obtain a new command value. Then, the

servo motor amplifiers

53a and 53b of the nip rolls 52a and 52b are controlled by the new command value. If this is done, when the data indicates that the illustration IL is shifted upstream in the transport direction, the peripheral speed value (m / sec) is changed from the current value by the change amount ΔV. Is increased by an absolute value, and thereby the amount of deviation of the illustration IL toward the upstream side is reduced. On the other hand, when the data indicates that the illustration IL is shifted downstream in the transport direction, the peripheral speed value (m / sec) is made smaller by the absolute value of the change amount ΔV than the current value. Thus, the amount of deviation of the illustration IL toward the downstream side is reduced.

Incidentally, in this example, such a change operation is performed every time the above data is transmitted to the controller 55. And thereby, adjustment which makes a deviation | shift amount small is made | formed with respect to the total number of each part which becomes a diaper in the continuous sheet | seat 5a of a back sheet | seat, but it is not restricted to this at all. For example, the above change operation may be performed at a rate of once for a plurality of transmissions.

By the way, as shown in the schematic plan view of FIG. 8A, the direction along the CD direction when the production line LM is viewed in plan view is defined as “X1 direction”, and the direction orthogonal to the CD direction is defined. If this is defined as “Y1 direction”, in the above-described example, the conveying direction of the continuous sheet 5a is directed to the Y1 direction over the entire length of the processing system L5a of the continuous sheet 5a of the back sheet. Therefore, the conveying direction of the continuous sheet 5a of the back sheet is any position of the arrangement position of the rotating shaft portion 21a related to the feeding device 21 and the arrangement positions of the three

rolls

31u, 31m, and 31d related to the tension measuring device 31. Although it was along the Y1 direction, it is not limited to this. For example, it may be as shown in the schematic plan view of FIG. 8B.
That is, as shown in FIG. 8B, at the arrangement positions of the rotary shaft portion 21a and the

rolls

31u, 31m, and 31d, the conveying direction of the continuous sheet 5a is aligned with the intersecting direction intersecting the Y1 direction in plan view. More specifically, in the example of FIG. 8B, the conveyance direction of the continuous sheet 5a at each of the arrangement positions is set to the X1 direction. However, in that case, the conveyance direction of the continuous sheet 5a is changed from the X1 direction to the Y1 at a position between the arrangement position of the three

rolls

31u, 31m, and 31d related to the tension measuring device 31 and the arrangement position of the feeding device 51. Need to change direction. Therefore, in this example, for example, a turn bar TB (corresponding to a rod-shaped member) made of a round bar having a diameter of 25.4 mm is disposed at the above position. Specifically, the turn bar TB is disposed so as not to be movable and rotatable in a state in which the longitudinal direction thereof is oriented in a direction inclined by 45 ° from both the X1 direction and the Y1 direction. Therefore, when the continuous sheet 5a of the back sheet is wound around the turn bar TB, the conveying direction of the continuous sheet 5a is changed from the X1 direction to the Y1 direction.
According to the configuration having the turn bar TB, as shown in FIG. 8B, the feeding device 51 in the X1 direction (that is, the direction intersecting the Y1 direction connecting the feeding device 51 and the joining position Pj in plan view). The three

rolls

31u, 31m, 31d related to the tension measuring device 31 and the rotating shaft portion 21a related to the feeding device 21 can be arranged at positions deviating from the above. Therefore, the overall length of the production line LM can be shortened in the Y1 direction, and as a result, the production line LM can be made compact.

However, when the turn bar TB is provided, when the tension fluctuation of the continuous sheet 5a of the back sheet occurs at the position of the turn bar TB, the continuous sheet 5a is caught on the non-rotating turn bar TB or between the turn bars TB. It becomes easier to induce troubles such as excessive sliding resistance. However, with regard to this point, in this example, as described above, the problem of the occurrence of new tension fluctuations due to the inertial force of the three

rolls

31u, 31m, 31d is largely avoided, and so on. The fluctuation of the tension of 5a is suppressed. Therefore, the above trouble induction can be effectively prevented.

FIG. 9 is a schematic side view of the production line LM of the first modified example of the present embodiment.
As shown in FIG. 9, the main difference from the above-described embodiment (FIG. 4) is that the three

rolls

31u, 31m, 31d related to the tension measuring device 31 in the processing system L5a of the continuous sheet 5a of the back sheet. And a tension adjusting device 41 for adjusting the tension in the conveying direction of the continuous sheet 5a is additionally provided at a position between the nip rolls 52a and 52b of the feeding device 51. Other configurations are generally the same as those in the above-described embodiment. Therefore, in the following, this difference will be mainly described, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

The tension adjusting device 41 includes three

rolls

41u, 41m, and 41d having the same structure as the three

rolls

31u, 31m, and 31d of the tension measuring device 31, and the device 41 includes these three rolls. In a state where the back sheet continuous sheet 5a is hung around the

rolls

41u, 41m, 41d in a chevron shape, the back sheet continuous sheet 5a with respect to the middle roll 41m of these three

rolls

41u, 41m, 41d. The apparatus 41 includes a second sensor (not shown) that outputs a value corresponding to the applied force in real time, and the device 41 is a drive roll disposed upstream of the middle roll 41m in the transport direction. 41k, a drive roll 41 that rotates by a servo motor (not shown) to contact the continuous sheet 5a and send the continuous sheet 5a downstream in the conveying direction. Has also the apparatus 41 includes a controller 41c, such as a PLC or sequencer for controlling the drive roll 41k based on the value output from the second sensor.

The three

rolls

41u, 41m, and 41d are each supported so as to be rotatable around a rotation axis along the CD direction. That is, a bearing member (not shown) is provided at the end of each

roll

41u, 41m, 41d in the CD direction so as not to move to a fixed position of the production line LM, and thereby each

roll

41u, 41m, 41d. Is supported at both ends by a bearing member so as to be rotatable and non-translatable. Each of the bearing members of the middle roll 41m among the three

rolls

41u, 41m, 41d is provided with a strain gauge (not shown) as an example of the second sensor. A gauge outputs the value according to the force provided to the said roll 41m from the continuous sheet 5a of a back sheet in real time. That is, a value corresponding to the force in the radial direction of the roll 41m acting on the roll 41m is output in real time. The output value from the strain gauge is input to the controller 41c, and multiplied by an appropriate coefficient or the like in the controller 41c, whereby the tension value (N) (" Equivalent to the value related to tension). Then, the controller 41c controls the peripheral speed value (m / sec) of the drive roll 41k so that the tension value is aligned with the specified tension target value (corresponding to the “second target value”).

More specifically, such control is performed, for example, by repeatedly performing the following processing at a predetermined control cycle. First, the amount of deviation of the tension value from the tension target value is obtained by subtracting the former from the latter. Next, the control amount is calculated by multiplying this deviation amount by a predetermined control gain, and the control amount is added to the command value of the current peripheral speed value (m / sec) to obtain a new command value. And the drive roll 41k is rotated with this new command value. Therefore, when the tension value is larger than the target tension value, the peripheral speed value (m / sec) is made larger than the current value by the absolute value of the control amount, so that the tension value becomes the target tension value. On the other hand, when the tension value is smaller than the target tension value, the peripheral speed value (m / sec) is made smaller by the absolute value of the control amount than the current value, so that the tension value is It increases to approach the tension target value.

Then, if the peripheral speed value of the drive roll 41k is changed so that the tension value is aligned with the tension target value in this way, the feeding device 51 located downstream in the conveying direction temporarily extends the continuous sheet 5a of the back sheet. Even when the tension of the continuous sheet 5a fluctuates when the state is changed and this fluctuation goes back to the upstream side in the transport direction, the fluctuation is reduced by changing the peripheral speed value of the drive roll 41k. Can do. Thereby, the tension adjusting device 41 can send the continuous sheet 5a of the back sheet in which the fluctuation of the tension is suppressed to the feeding device 51, and as a result, the feeding device 51 can feed the continuous sheet 5a of the back sheet. The extension state can be changed with high accuracy.
Further, these three

rolls

41u, 41m, and 41d are supported at fixed positions as described above, and thus hardly move except for rotation. That is, basically no translation is performed. Therefore, the above-described problem that may occur when at least one of the

rolls

41u, 41m, and 41d is translated, that is, the continuous sheet 5a of the back sheet due to the inertial force of the roll accompanying the translational movement. Therefore, it is possible to substantially avoid the problem of new fluctuations in tension, and as a result, the continuous sheet 5a can be sent to the feeding device 51 with the fluctuations suppressed. Thereby, the delivery device 51 can change the extension state of the continuous sheet 5a with high accuracy.

Further, when the tension adjusting device 41 is provided, the tension adjusting device 41 can reduce the tension variation of the continuous sheet 5 a caused by the feeding device 51 before the reduction in the feeding operation of the feeding device 21. Can be reduced. Therefore, the fluctuation in tension can be reduced more instantaneously. As a result, the feeding device 51 can change the extension state of the continuous sheet 5a with higher accuracy.

Note that, from the viewpoint of immediacy, it is desirable to dispose the tension adjusting device 41 close to the feeding device 51. For that purpose, the arrangement position of the three

rolls

41u, 41m, 41d of the tension adjusting device 41 and the arrangement position of the driving roll 41k in the conveyance path of the continuous sheet 5a of the back sheet are determined by the feeding device 21 as the sheet roll. It is preferable that the feeding device 51 is closer to the feeding position at which the continuous sheet 5a is fed out than the feeding position at which the continuous sheet 5a is fed from 5ar.

Further, from the viewpoint of immediacy, the controller 41c of the tension adjusting device 41 controls the rotation operation of the drive roll 41k, not only the tension value of the second sensor described above, but also the image of the sending device 51 described above. It is desirable that the detection is performed in consideration of the detection signal of the illustration IL generated by the processing device 57ip (that is, data of the deviation amount in the conveyance direction of the illustration IL). For example, the detection signal is input from the image processing device 57ip to the controller 41c, and the controller 41c multiplies the deviation amount in the transport direction of the illustration IL indicated by the detection signal by a specified gain, and the change amount ΔV Is calculated. Then, the change amount ΔV and the control amount related to the tension value of the second sensor described above are added to the command value of the current peripheral speed value of the drive roll 41k to obtain a new command value, and It is preferable to rotate the drive roll 41k with a new command value.

In this way, the influence of the change in the extension state by the feeding device 51 is detected upstream by the second sensor of the tension adjusting device 41 as the fluctuation of the tension of the continuous sheet 5a of the back sheet. Prior to being done, the drive roll 41k of the tension adjusting device 41 can rotate so that the fluctuations in tension are reduced. Therefore, it is possible to suppress the fluctuation of the tension of the continuous sheet 5a earlier.

Further, the tension adjusting device 41 also functions as a relaxation device that relaxes the stretched state of the continuous sheet 5a that has been enlarged by the feeding device 21. That is, in the tension adjusting device 41, the stretched state of the continuous sheet 5a is relaxed so as to be smaller than the stretch magnification Munw of the continuous sheet 5a stretched by the feeding device 21. When the stretched state is relaxed in this way, problems such as width shrinkage, vertical stripes, folding, and the like that may occur in the continuous sheet 5a while being conveyed from the tension adjusting device 41 to the feeding device 51 are effectively utilized. Can be prevented. Also, from the viewpoint of further enhancing this prevention effect, desirably, the expansion ratio Mr of the continuous sheet 5a after relaxation by the tension adjusting device 41 is smaller than the expansion ratio Ms of the continuous sheet 5a after being changed by the feeding device 51. In this example, the extension magnification Mr is set to 1.017 in order to do so. The extension magnification is set by setting the tension target value described above to a value corresponding to the extension magnification Mr in the controller 41c. The tension target value is obtained by the feeding device 21 described above. Since it is the same as the method described, the description thereof is omitted.

FIG. 10 is a schematic side view of the production line LM of the second modified example of the present embodiment.
The main differences from the first modification described above are (1) that two

feeding devices

21 and 21 are provided, and (2) the rotating shaft portion 21a of the feeding device 21 and the tension measuring device 31 in the transport direction. That the material splicing device 25 is provided between the three

rolls

31u, 31m and 31d, and (3) between the material splicing device 25 and the three

rolls

41u, 41m and 41d of the tension adjusting device 41. In addition, the storage device 35 capable of storing the continuous sheet 5a of the back sheet in the form of a loop is disposed. Other configurations are generally the same as those in the above-described embodiment. Therefore, below, these differences are mainly demonstrated, the same code | symbol is attached | subjected about the same structure, and the description is abbreviate | omitted.

The two

feeding devices

21 and 21 have

rotating shaft portions

21a and 21a, respectively. And the structure and operation | movement of each rotating shaft part 21a are the same as the content demonstrated in this embodiment. For example, the

rotary shaft portions

21a and 21a are respectively driven and rotated by a servo motor as a drive source, and the

rotary shaft portions

21a and 21a are respectively formed in through holes provided in the center of the sheet rolls 5ar and 5ar. Inserted. Then, in a state where the sheet roll 5ar is supported by the rotation shaft portion 21a, the rotation shaft portion 21a is basically driven based on the tension value derived from the output value from the first sensor 31s (FIG. 5). By rotating, the continuous sheet 5a of the back sheet is fed out from the sheet roll 5ar.
However, these two

feeding devices

21 and 21 are used by switching alternately. That is, while one feeding device 21 feeds the continuous sheet 5a of the back sheet, the other feeding device 21 is substantially in a standby state, and the continuous sheet 5a of the back sheet of the one feeding device 21 is likely to disappear. Instead of this, instead of this, the other feeding device 21 in the standby state starts the feeding operation of the continuous sheet 5a of the back sheet.

The material splicing device 25 is a device that connects the continuous sheet 5a of the back sheet fed by one feeding device 21 to the continuous sheet 5a of the back sheet of the sheet roll 5ar that is supported by the other feeding device 21 and is on standby. . And thereby, the continuous sheet 5a of a back sheet can be let out continuously without interruption.

The material splicing device 25 has a well-known configuration and includes, for example, a clamp mechanism (not shown) and a cutter mechanism (not shown). Then, connection processing is performed as follows. First, the front end portion 5ae of the continuous sheet 5a of the back sheet of the sheet roll 5ar waiting in the other feeding device 21 is placed on one pressing member of the clamp mechanism, and a double-sided tape is attached to the front end portion 5ae. Install. Next, while one feeding device 21 stops the feeding operation of the continuous sheet 5a of the back sheet, the one clamping member is moved toward the other clamping member facing the continuous sheet 5a. Then, the pair of pressing members press the three members of the continuous sheet 5a, the double-sided tape, and the front end portion 5ae, and thereby the continuous sheet 5a that is stopped to be fed by one feeding device 21 and the other sheet The continuous sheet 5a of the waiting sheet roll 5ar is connected by the feeding device 21. If it does so, the continuous sheet 5a of one feeding device 21 will be cut | disconnected by the cutter mechanism in the upstream position of a conveyance direction rather than the part connected with the double-sided tape during this clamping state. After that, if the clamping state of the pair of clamping members is released, the continuous sheet 5a of the back sheet is fed from the sheet roll 5ar of one feeding device 21 to the sheet roll 5ar of the other feeding device 21. The role 5ar is switched.

The storage device 35 is a device for storing the continuous sheet 5a of the back sheet fed from the feeding device 21 so as to be supplied downstream in the conveying direction. The accumulating device 35 reciprocates in the vertical direction as a direction in which the size of the loop of the continuous sheet 5a of the back sheet can be changed, and a fixed roller group G35s composed of a plurality of fixed

rollers

35s, 35s. A moving roller group G35m composed of a plurality of moving

rollers

35m, 35m guided so as to be movable, an actuator (not shown) for reciprocating the moving roller group G35m in the vertical direction, and a controller (not shown) such as a PLC for controlling the actuator. (Shown).

The continuous sheet 5a of the back sheet is alternately wound around the fixed rollers 35s belonging to the fixed roller group G35s and the moving rollers 35m belonging to the moving roller group G35m, and thereby the continuous sheet 5a of the back sheet. The loop is formed. Therefore, if the moving roller group G35m moves in the direction away from the fixed roller group G35s (downward in the example of FIG. 10), the loop becomes large and the continuous sheet 5a of the back sheet is accumulated, while the moving roller group in the vertical direction. If G35m moves in a direction approaching the fixed roller group G35s (upward in the example of FIG. 10), the loop becomes smaller and the accumulated continuous sheet 5a is supplied to the feeding device 51.

Here, as described above, when the feeding operation is switched from one feeding device 21 to the other feeding device 21, the feeding speed value Vunw of the continuous sheet 5a by one feeding device 21 is gradually decreased. Thus, the feeding operation shifts to stop. In this case, the storage device 35 supplies the continuous sheet 5a of the back sheet to the feeding device 51 by reducing the loop. Therefore, the delivery device 51 can continuously perform the delivery operation while changing the extended state without being affected by the stop of the delivery operation. Further, the supply operation of the storage device 35 is continued until the connection processing of the continuous sheet 5a by the material splicing device 25 is completed, but the connection processing is completed and the feeding operation in the other feeding device 21 is completed. When the state becomes possible, the accumulating device 35 accumulates the continuous sheet 5a fed from the other feeding device 21 by enlarging the loop. When the loop reaches a specified length, the actuator is arranged so that the moving roller group G35m does not move from the fixed position in the vertical direction corresponding to the specified length until the next feeding operation is switched. Holds the moving roller group G35m. Therefore, when the moving roller group G35m moves, fluctuations in the tension of the continuous sheet 5a that can be caused by the inertial force of each moving roller 35m can be suppressed.

Here, as the actuator, an actuator capable of position control is used, and in this example, a linear servo motor is used. The linear servo motor includes a base member, a slider member guided so as to be reciprocally movable in the vertical direction with respect to the base member, and a linear encoder that measures the actual position of the slider member in the vertical direction. Then, the moving rollers 35m of the moving roller group G35m are rotatably supported by the slider via unillustrated bearing members. Further, as described above, the linear servo motor moves the slider in the vertical direction based on the position control. That is, the motor moves the slider so that the deviation between the actual position of the slider output from the linear encoder and the vertical command position indicated by the control signal transmitted from the controller is small. Therefore, the controller can transmit the control signal including the above-mentioned fixed position as the command position to the motor, thereby realizing the holding of the moving roller group G35m at the fixed position as described above.

On the other hand, the supply operation of the continuous sheet 5a performed by the storage device 35 when switching the feeding operation is performed as follows, for example. First, the tension value output from the tension measuring device 31 is always input to the controller. On the other hand, when the feeding operation of one feeding device 21 is shifted to stop so as to perform the switching, the continuous sheet 5a is not fed from the one feeding device 21, but nevertheless, the downstream feeding device 51 Since the continuous sheet 5a is fed to the head, the tension value output from the tension measuring device 31 can be increased. However, at this time, the controller controls the linear servo motor so that the tension value is aligned with a prescribed tension target value (corresponding to the third target value). That is, the controller calculates the command position so that the tension value is aligned with the tension target value, and controls the motor by transmitting a control signal including the command position to the motor. Therefore, the motor moves the slider so that the tension value to be increased returns to the tension target value. That is, the moving roller group G35m is raised so that the loop becomes small, and as a result, the continuous sheet 5a is supplied from the accumulation device 35 to the downstream delivery device 51 without stopping.

Further, the accumulation operation of the continuous sheet 5a performed by the accumulation device 35 after the connection process is completed is performed as follows, for example. First, since this time is immediately after switching of the feeding operation, the feeding operation of the other feeding device 21 has already been started at this time. The feeding operation is performed based on the tension value output from the tension measuring device 31 as described above. That is, the continuous sheet 5a is fed out from the other feeding device 21 so that the tension value becomes equal to the tension target value (corresponding to the fourth target value). Therefore, if the controller controls the position of the linear servo motor and lowers the moving roller group G35m to the above-mentioned fixed position, the above-mentioned lowering amount than the necessary amount of the continuous sheet 5a to be sent to the downstream feeding device 51 is required. The continuous sheet 5a is unwound from the unwinding device 21. As a result, while maintaining the state where the continuous sheet 5 a is fed to the feeding device 51, the loop is enlarged and the continuous sheet 5 a is accumulated in the accumulation device 35.

Desirably, when the loop is made smaller, the linear servo motor moves the moving roller group G35m upward by applying an upward force in the vertical direction to the moving roller group G35m. Similarly, when the loop is enlarged, the linear servo motor moves the moving roller group G35m downward by applying a downward force to the moving roller group G35m in the direction in which the loop increases in the vertical direction. Good.

And if it does in this way, the linear servomotor can receive and bear the force resulting from the inertia of the moving roller group G35m, thereby preventing the force caused by the inertia from acting on the continuous sheet 5a. be able to. As a result, it is possible to effectively prevent a new tension variation from occurring in the continuous sheet 5a due to the force, thereby suppressing the tension variation in the continuous sheet 5a as described above. In this state, it can be reliably sent to the delivery device 51.

FIG. 11 is a schematic side view of a production line LM according to a third modification of the present embodiment. 12A to 12E are schematic side views for explaining the connection processing performed in the third modification.
In the second modification described above, the material splicing device 25 in FIG. 10 waits at the other feeding device 21 for the continuous sheet 5a in a state where the feeding operation of the continuous sheet 5a by the one feeding device 21 is stopped. The continuous sheet 5a of the inner sheet roll 5ar is connected. However, in the third modified example of FIG. 11, the continuous sheet 5a being fed out by the one feeding device 21 is not stopped and the continuous sheet being fed out is stopped. The continuous sheet 5 a of the sheet roll 5 ar waiting on the other feeding device 21 is connected to 5 a. Thereby, in the third modification, the storage device 35 that is necessary due to the stop of the feeding operation is omitted. The points other than these are substantially the same as in the second modification. For this reason, the same components as those of the second modification are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 12A, the

rotary shafts

21a and 21a of the two

feeding devices

21 and 21 are each configured to perform box motion on, for example, a rectangular orbit TR21a. The circular orbit TR21a has a feeding operation execution position Pe where the rotating shaft portion 21a performs most of the feeding operation, a temporary retracting position Ph where the rotating shaft portion 21a is temporarily retracted just before the end of the feeding operation, and a feeding operation. A standby position Pr at which the completed rotating shaft portion 21a waits until the next feeding operation is set. Then, the feeding operation is switched from one rotary shaft portion 21a to the other rotary shaft portion 21a, for example, as follows.

As shown in FIG. 12A, first, at the feeding operation execution position Pe, one rotary shaft portion 21a is positioned, and the rotary shaft portion 21a is driven and rotated by a servo motor (not shown), whereby the sheet The continuous sheet 5a of the back sheet is fed out from the roll 5ar. Then, when the feeding operation is about to end, as shown in FIG. 12B, the rotary shaft portion 21a moves from the feeding operation execution position Pe to the upper temporary retreat position Ph while maintaining the feeding operation. And even after the movement to the same position Ph, the feeding operation is continued as it is.

On the other hand, at the same time as this movement or after that, as shown in FIG. 12C, the other rotating shaft portion 21a moves from the standby position Pr to the feeding operation execution position Pe. At this time, a new sheet roll 5ar is already attached to the other rotating shaft portion 21a at the standby position Pr. And if it moves to the feeding operation execution position Pe, the said other rotating shaft part 21a will be drive-rotated by a servomotor (not shown), and, thereby, the outer peripheral surface of the sheet roll 5ar of the other rotating shaft part 21a. The peripheral speed value (m / sec) is accelerated. Here, the peripheral speed value of the continuous sheet 5a of the one rotary shaft portion 21a at the temporary retraction position Ph is measured by an appropriate sensor such as a rotary encoder. When it is detected that the feed speed value Vunw (m / sec) is the same, the peripheral speed value is maintained at the same value as the feed speed value Vunw.

Then, as shown in FIG. 12D, the continuous sheet 5a fed out from one rotating shaft portion 21a at the temporary retreat position Ph is pressed by a roll-shaped pressing member 28p that can reciprocate, and thereby the continuous sheet 5a approaches the outer peripheral surface of the sheet roll 5ar of the other rotating shaft portion 21a at the feeding operation execution position Pe and is pressed against the outer peripheral surface. Then, the continuous sheet 5a is connected to the outer peripheral surface via an adhesive member (not shown) such as a double-sided tape provided in advance on the outer peripheral surface where the continuous sheet 5a is pressed. And the said continuous sheet 5a is cut | disconnected between the said adhesive member and one rotating shaft part 21a, and, thereby, the new sheet roll of the other rotating shaft part 21a from the old sheet roll 5ar of one rotating shaft part 21a The feeding operation is switched to 5ar.

Then, as shown in FIG. 12E, one rotating shaft portion 21a moves to the standby position Pr. Then, during the standby at the standby position Pr, the removal process of the old sheet roll 5ar and the installation process of the new sheet roll 5ar are performed on the one rotary shaft portion 21a.

Here, desirably, when switching the feeding operation from one rotary shaft portion 21a1 (21a) to the other rotary shaft portion 21a2 (21a), as shown in the schematic plan view of FIG. A predetermined position Paj in the illustration IL of the continuous sheet 5a of the back sheet fed out by the portion 21a1 (in the example of FIG. 13, the centroid position PIL of the illustration IL) and the back of the sheet roll 5ar supported by the other rotation shaft portion 21a2. In the illustration IL of the continuous sheet 5a of the sheet, the position Pajs corresponding to the predetermined position Paj may be aligned with respect to the conveyance direction. Specifically, the amount of deviation ΔPaj in the transport direction between the former position Paj and the latter position Pajs is within ± 5% (preferably within ± 1%) of the print pitch P5 (FIG. 6) of the illustration IL. The continuous sheet 5a of the sheet roll 5ar supported by the other rotating shaft portion 21a2 may be connected to the continuous sheet 5a fed out by one rotating shaft portion 21a1.

And in this way, the continuity of the continuous sheet 5a in the switching of the feeding operation is almost guaranteed even for the arrangement state of the illustration IL. This eliminates an excessive change in the stretched state that may need to be performed by the feeding device 51 when the discontinuity degree of the illustration IL is in a discontinuous state. This contributes effectively to changing the extension state of 5a with high accuracy.

Such alignment can be realized by using a sensor 29 (FIG. 14) having a similar configuration to the detection sensor 57 (FIG. 4) used in the above-described delivery device 51. FIG. 14 is a schematic side view for explanation. As shown in FIG. 14, the sensor 29 includes two

imaging devices

57c and 57c and an image processing device 57ip that performs image processing on each image data transmitted from the two

imaging devices

57c and 57c. Yes. One imaging device 57c of the two

imaging devices

57c, 57c is provided corresponding to the temporary retreat position Ph, and is a continuous sheet fed out from the old sheet roll 5ar at the same position Ph at the aforementioned feeding speed value Vunw. The illustration IL of 5a is detected. The other imaging device 57c is provided corresponding to the feeding operation execution position Pe, and is accelerated to the same circumferential speed value as the feeding speed value Vunw at the same position Pe and rotates at the circumferential speed value. The illustration IL of the new sheet roll 5ar is detected. Both of the

imaging devices

57c and 57c perform an imaging operation based on the above-described synchronization signal. For example, each time the rotation angle value of the synchronization signal matches a specified rotation angle value, the two

imaging devices

57c and 57c perform an imaging operation.

On the other hand, the image processing device 57ip performs binarization processing or the like on each transmitted image data each time the image data is transmitted from the two

imaging devices

57c and 57c, and thereby the image data of each image data is transmitted. The pixels of the image capturing portion of the illustration IL in the image are extracted, and the position coordinates of each pixel are obtained. Then, the value of the Y coordinate of the position coordinate of the illustration IL of the new sheet roll 5ar is subtracted from the value of the Y coordinate of the position coordinate of the illustration IL of the continuous sheet 5a of the old sheet roll 5ar, thereby obtaining a subtraction value. And this subtraction value is transmitted to the controller 21c which controls rotation operation | movement of the

rotating shaft parts

21a and 21a.

Here, the range of the subtraction value in the alignment state as described above, that is, the range of the subtraction value in the alignment state in which the deviation amount ΔPaj in the transport direction is within ± 5% of the print pitch P5 of the illustration IL. Is previously known by experiments or the like, and such a range is stored in advance in the memory of the controller 21c. Accordingly, when the subtraction value transmitted from the image processing device 57ip is not within the above range, the processor of the controller 21c multiplies the subtraction value by a predetermined control gain to obtain the acceleration value (m / sec ² ). The rotation shaft 21a located at the feeding operation execution position Pe is accelerated by this acceleration value, and after this acceleration, the speed is decelerated by substantially the reverse operation of the acceleration, and the peripheral speed value of the sheet roll 5ar is determined as the peripheral speed value before acceleration. Return to. As a result, the position of the illustration IL of the new sheet roll 5ar is changed to the continuous sheet 5a of the old sheet roll 5ar while maintaining the peripheral speed value of the new sheet roll 5ar at the same value as the feeding speed value Vunw. It moves relative to the position of the illustration IL in the downstream in the transport direction, and thereby the former position can be brought closer to the latter position. Then, by repeating this process every time the above imaging operation is performed, the above alignment is realized.

Incidentally, also in the above-described second modified example (FIG. 10), the above-described alignment is performed, that is, the alignment is performed so that the deviation amount ΔPaj in the conveyance direction is within ± 5% of the print pitch P5 of the illustration IL. Also good. However, when the continuous sheet 5a of the old sheet roll 5ar and the continuous sheet 5a of the new sheet roll 5ar are connected, the material splicing device 25 of the second modified example stops the feeding operation from the new sheet roll. In addition, the feeding operation from the old sheet roll 5ar is also stopped. Therefore, in this case, the alignment operation can be performed manually by the operator. The manual operation can be understood without further explanation, and the explanation thereof is omitted.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

In the above-described embodiment and the like, the top sheet continuous sheet 3a is illustrated as the first sheet and the back sheet continuous sheet 5a is illustrated as the second sheet, but the present invention is not limited thereto. For example, the first sheet is a continuous sheet of an exterior sheet that forms the exterior of a diaper, and the second sheet is a continuous sheet of an illustration sheet that is joined to the skin side of the exterior sheet and visible through the sheet. Alternatively, it may be a continuous sheet of a leak-proof sheet on which an illustration IL is printed.

In the above-described embodiment and the like, the illustration IL is illustrated as an example of the display element, and the illustration IL is configured by combining a plurality of symbols G, G... For example, as shown in FIG. 7, the illustration IL may have only one symbol G. Further, the illustration IL may be composed of animals and plants such as flowers and symbols other than characters, and may be composed of symbols such as characters and geometric patterns, for example. Furthermore, the formation of the display element is not limited to printing. For example, the pattern of the display element may be formed by pressing the continuous sheet 5a of the back sheet as the second sheet in the thickness direction to form a plurality of dot-like recesses or a plurality of linear recesses.

In the above-described embodiment, the unit signal of the synchronization signal is a signal indicated by a rotation angle value of 0 ° to 360 °. However, the present invention is not limited to this. For example, the unit signal of the synchronization signal may be configured with a digital value such as 0 to 8191. In the above description, the rotary encoder provided in the cutter device 80 in FIG. 4 generates the synchronization signal. However, the present invention is not limited to this. For example, an appropriate controller (not shown) such as a PLC may be generated. That is, the controller has a processor and a memory, and a program for generating a synchronization signal is stored in the memory in advance, and the processor reads out the program from the memory and executes it, whereby the unit signal of the synchronization signal May be generated repeatedly. Furthermore, the generation of the synchronization signal may be performed by an appropriate electric circuit instead of the processor that has read the program.

In the above-described embodiment and the like, an apparatus having the imaging device 57c and the image processing device 57ip is exemplified as the detection sensor 57 related to the delivery device 51, but the present invention is not limited to this. That is, any sensor can be used as long as it can detect the above-described illustration IL and acquire the deviation amount in the transport direction. For example, a sensor having a phototube may be used. That is, the difference between the time when the detection signal is output from the phototube after detecting the passage of the illustration IL through the position of the phototube and the time when the synchronization signal outputs the above-mentioned prescribed rotation angle value stored in the memory in advance. Based on the above, the rotational operation of the nip rolls 52a and 52b of the delivery device 51 may be controlled.

In the above-described embodiment and the like, the disposable diaper is illustrated as an example of the absorbent article. However, the absorbent article is not limited to this as long as it is an article that absorbs the excretion fluid of the wearer. For example, the absorbent article is a sanitary napkin. Or a urine absorbing pad.

In the above-described embodiments and the like, the illustration IL is illustrated as the display element, and as illustrated in FIG. 6, the illustrations IL and IL adjacent to each other at the printing pitch P5 in the continuous direction in the continuous sheet 5a of the back sheet are exactly the same in configuration. However, it is not limited to this. That is, as shown in FIG. 15, illustrations IL1 and IL2 having different configurations may be used. In this case, however, the illustrations IL1 and IL2 are arranged so that the centroid positions PIL1 and PIL2 in the conveyance direction of the illustrations IL1 and IL2 having different configurations are in the same position in each region corresponding to the printing pitch P5. IL2 is printed. As a result, even when the illustrations IL1 and IL2 are different from each other, the detection sensor 57 described above can correctly calculate the shift amount of the illustrations IL1 and IL2 in the transport direction.

In the above-described embodiment and the like, as shown in FIG. 4, as an example of the feeding device 21, a rotation shaft portion 21 a that is inserted into a through hole at the center of the sheet roll 5 ar and rotatably supports the sheet roll 5 ar, Although a configuration including a drive source connected to the rotary shaft portion 21a and driving and rotating the rotary shaft portion 21a by applying a rotational force to the rotary shaft portion 21a has been disclosed, the invention is not limited to this. For example, as shown in FIG. 1, the back sheet continuous sheet 5a may be fed out from the sheet roll 5ar by driving and rotating a belt member 21 'disposed in contact with the outer peripheral surface of the sheet roll 5ar. However, in this configuration, the belt member 21 ′ rubs against the outer peripheral surface of the sheet roll 5 ar to cause wrinkles in the continuous sheet 5 a portion of the back sheet located on the outer peripheral surface or to loosen the same portion. The continuous sheet 5a may be fed out toward the feeding device 51 in a state where wrinkles and slack are generated. Therefore, desirably, the feeding device 21 of the above-described embodiment is used so that such a problem does not occur.

In the above-described embodiment and the like, the “tension value” is illustrated as an example of “the value related to the tension indicated by the value of the first sensor”, but the present invention is not limited to this. That is, any value other than the tension value may be used as long as the value increases or decreases in conjunction with the tension value. For example, a value obtained by multiplying a tension value by a predetermined constant (including a fraction) may be used, or a value obtained by adding a predetermined second constant (including a negative value) may be used. A combined value may be used. In that case, it is needless to say that each tension target value corresponding to the “first, third, and fourth target values” according to the claims is set in correspondence with the above-described values. .

In the first to third modifications described above, the “tension value” is illustrated as an example of “the value related to the tension indicated by the value of the second sensor”, but the present invention is not limited to this. That is, any value other than the tension value may be used as long as the value increases or decreases in conjunction with the tension value. For example, a value obtained by multiplying a tension value by a predetermined constant (including a fraction) may be used, or a value obtained by adding a predetermined second constant (including a negative value) may be used. A combined value may be used. In this case, it is needless to say that the tension target value as the “second target value” according to the claims is set in correspondence with the above value.

In the second modification described above, as shown in FIG. 10, the storage device 35 is disposed at a position downstream of the tension measuring device 31 in the transport direction, but this is not a limitation. For example, the storage device 35 may be arranged at a position upstream of the tension measuring device 31 in the transport direction. More specifically, the storage device 35 may be disposed between the material splicing device 25 and the tension measuring device 31.

In the above-described embodiment and the like, a strain gauge is illustrated as an example of the first sensor 31s, but the present invention is not limited thereto. For example, a load cell may be used.

In the first to third modifications described above, the strain gauge is illustrated as an example of the second sensor, but the present invention is not limited to this. For example, a load cell may be used.

In the second modified example described above, the controller 35 controls the linear servo motor based on the tension value output from the tension measuring device 31 to control the supply operation of the storage device 35 when the feeding operation is stopped. It was done by raising G35m, but it is not limited to this. For example, when the necessary amount (m) per unit time of the continuous sheet 5a to be sent to the downstream feeding device 51 when the feeding operation is stopped can be predicted in relation to the time axis, the feeding operation is performed. About the ascending operation pattern (the graph of the relationship between the ascending speed (m / sec) and the time (sec)) for ascending the moving roller group G35m without loosening and pulling the continuous sheet 5a when stopping. Can also be calculated. Therefore, the above supply operation may be realized by storing the operation pattern in advance in the memory of the controller in the form of a program, and the controller processor controlling the position of the linear servo motor based on the program.

In the second modification described above, the accumulating device 35 accumulates the continuous sheet 5a up to a specified length at a relatively early time after the supply operation of the continuous sheet 5a, and then the next feeding operation. The linear servo motor holds the moving roller group G35m by position control so that the moving roller group G35m does not move from the fixed position in the vertical direction corresponding to the specified length until the switching of Not exclusively. For example, the storage device 35 that has performed the supply operation may perform the storage operation immediately before the next feeding operation is switched. In that case, the storage device 35 maintains the loop of the continuous sheet 5a in a small loop state immediately after the supply operation until the start of the storage operation. The linear servo motor may hold the moving roller group G35m by position control so that the moving roller group G35m does not move from the vertical position corresponding to this loop. In this way, when the moving roller 35m moves over a period from the end time of the supply operation to the start time of the accumulation operation, the continuous sheet 5a that can be generated by the inertia caused by the inertia of the roller 35m. Tension fluctuation can be effectively suppressed.

1 Absorbent body, 1a Continuous body of absorbent body (sheet-like member), 3 Top sheet, 3a Continuous sheet of top sheet (1st sheet), 4 Absorber, 4c Absorbent core, 5 Back sheet, 5a Back sheet Continuous sheet (second sheet), 5ae tip, 5ar sheet roll, 11 conveying device, 15 joining device, 15u belt conveyor, 15d belt conveyor, 21 feeding device, 21a rotating shaft portion, 21a1 rotating shaft portion, 21a2 rotating shaft Part, 23 belt conveyor, 21c controller, 25 material splicing device, 28p pressing member, 29 sensor, 31 tension measuring device, 31k converter, 31u roll, 31m roll, 31d roll, 31s strain gauge (first sensor), 35 Accumulator, 35m moving roller 35s fixed roller, 41 tension adjustment device, 41c controller, 41k drive roll, 41u roll, 41m roll, 41d roll, 51 delivery device, 52a nip roll, 52b nip roll, 53a amplifier, 53b amplifier, 55 controller, 57 detection sensor, 57c Camera (imaging device), 57ip image processing device, 80 cutter device, 81a anvil roll, 81c cutter roll, 82 cutter blade, LM production line, L3a top sheet continuous sheet processing system, L5a back sheet continuous sheet processing system , Brg bearing member, TB turn bar (bar-shaped member), G35m moving roller group, G35s fixed roller group, TR21a orbit, C52a rotating shaft, C52b Rotation axis, IL illustration (display element), IL1 illustration (display element), IL2 illustration (display element), ILa illustration (display element), A5 area, A5p area, G symbol, F5a force, Pj merging position, Pe feeding operation Execution position, Ph temporary retracted position, Pr standby position, PIL centroid position, PIL1 centroid position, PIL2 centroid position, Paj predetermined position, position corresponding to Pajs predetermined position,

Claims

A method for producing a sheet-like member according to an absorbent article by stacking and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A feeding device that feeds the second sheet that is fed out and transported with the continuous direction as the transport direction, to a merging position of the transport path of the first sheet;
In the feeding, in the state where the second sheet is hung around three rolls rotatably supported at a fixed position upstream of the feeding device in the transport direction, The first sensor outputs a value corresponding to the force applied from the second sheet to the middle roll, and based on the value, the feeding device feeds the second sheet from the sheet roll. Perform the action
In the sending out, the display elements on the first sheet are determined so that the display elements of the second sheet conveyed in the conveyance direction are arranged at the first pitch and based on the first pitch. The method for manufacturing a sheet-like member according to an absorbent article, wherein the feeding device changes the extended state of the second sheet in the transport direction so that the display element is positioned at a target position for placement.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1,
The feeding device includes a rotation shaft portion, and a drive source that is connected to the rotation shaft portion and applies rotational force to the rotation shaft portion to drive and rotate the rotation shaft portion.
The rotary shaft is driven based on the value of the first sensor in a state where the rotary shaft is inserted into a through-hole in the center of the sheet roll and the sheet roll is supported by the rotary shaft. The method for producing a sheet-like member according to an absorbent article, wherein the feeding operation is performed by rotation.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 1 or 2,
The sheet-like article relating to an absorbent article, wherein the feeding operation of the feeding device is performed such that a value related to the tension indicated by the value of the first sensor approaches a prescribed first target value. Manufacturing method of member.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 3,
The first sheet is so stretched in the conveying direction that the second sheet is at the middle roll position, rather than in the middle roll, after the stretching ratio of the second sheet has been changed by the feeding device. The target value is set, The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by the above-mentioned.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to any one of claims 1 to 4,
The second sheet is conveyed from the delivery device to the merging position along a predetermined direction in plan view,
In the arrangement position of the three rolls, the second sheet is conveyed along an intersecting direction intersecting the predetermined direction in a plan view,
The second sheet is wound around a rod-shaped member disposed at a position between the three rolls and the feeding device in the transport direction, so that the transport direction of the second sheet is changed from the intersecting direction. The method for manufacturing a sheet-like member according to an absorbent article, wherein the sheet-like member is changed in the predetermined direction.
A method for manufacturing a sheet-like member according to any one of claims 1 to 5,
A tension adjusting device for adjusting the tension in the transport direction of the second sheet is disposed at a position between the three rolls and the feeding device in the transport direction,
The tension adjusting device includes three rolls rotatably supported at a fixed position, and a driving roll disposed upstream of the middle roll of the three rolls in the transport direction, The drive roll that rotates to drive the second sheet in contact with the second sheet and send the second sheet downstream in the transport direction;
A value corresponding to the force applied from the second sheet to the middle roll of the three rolls in a state where the second sheet is wound around the three rolls of the tension adjusting device. And a tension in the transport direction of the second sheet is adjusted by driving and rotating the driving roll based on the value. Manufacturing method of a shaped member.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 6,
The arrangement position of the three rolls and the arrangement position of the driving roll of the tension adjusting device in the conveyance path of the second sheet are set to be more than the feeding position where the feeding device feeds the second sheet from the sheet roll. A method for producing a sheet-like member according to an absorbent article, characterized in that the apparatus is closer to a delivery position for delivering the second sheet.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 6 or 7,
The drive rotation of the drive roll is controlled such that the value relating to the tension indicated by the value of the second sensor approaches a prescribed second target value,
The extension magnification in the conveyance direction of the second sheet at the position of the middle roll of the tension adjusting device is the extension magnification in the conveyance direction of the second sheet at the position of the middle roll related to the feeding. And the second target value is set so as to be smaller than both of the expansion magnifications in the transport direction of the second sheet after the extension state is changed by the feeding device. The manufacturing method of the sheet-like member which concerns on this.
A method for producing a sheet-like member according to any one of claims 6 to 8,
The delivery device includes a delivery roll that rotates in contact with the second sheet so as to send the second sheet downstream in the transport direction, a detection sensor that detects a position of the display element and outputs a detection signal; And a controller for controlling the rotation operation of the delivery roll based on the detection signal,
When the detection signal indicates that the display element of the second sheet is shifted by an amount of shift upstream of the arrangement target position in the transport direction, the controller outputs the detection signal. The tension adjusting device increases the peripheral speed value of the feed roll based on the detection signal, and changes the direction of increasing the peripheral speed value based on the detection signal and the value output from the second sensor. Based on the peripheral speed value of the drive roll,
When the detection signal indicates that the display element in the second sheet is shifted downstream in the transport direction from the arrangement target position, the controller is configured to cause the peripheral speed of the feed roll to The tension adjusting device reduces the value based on the detection signal based on the amount of change in the direction of decreasing the peripheral speed value and the value output from the second sensor. The manufacturing method of the sheet-like member which concerns on the absorbent article characterized by changing a circumferential speed value.
A method for producing a sheet-like member according to any one of claims 1 to 9,
At least two feeding devices for feeding the second sheet from the sheet roll are provided;
A storage device capable of storing the second sheet in the form of a loop is disposed at a position between the feeding device and the feeding device in the transport direction,
In order to switch the feeding operation from one feeding device of the two feeding devices to the other feeding device, when the feeding operation of the second sheet by the one feeding device shifts to stop, When the storage device reduces the loop, the storage device supplies the second sheet to the feeding device, and the second sheet whose feeding operation in the one feeding device is stopped is changed to the other sheet. The other feeding device is connected to the second sheet of the sheet roll supported by the feeding device, and then the other feeding device starts the feeding operation of the second sheet from the sheet roll. The storage device stores the second sheet fed from the storage device by enlarging the loop. ,
The accumulator includes a plurality of fixed rollers arranged at fixed positions, a moving roller guided so as to be able to reciprocate in a direction in which the size of the loop of the second sheet can be changed with respect to the fixed rollers, An actuator that reciprocates the moving roller with the direction as the moving direction, and the loop is formed by the second sheet being wound around the fixed roller and the moving roller,
By moving the moving roller in the direction in which the moving roller approaches the fixed roller, the loop is reduced, and the accumulated second sheet is supplied to the feeding device,
The actuator moves the moving roller in a direction in which the moving roller moves away from the fixed roller, whereby the loop is enlarged to a predetermined length, and the second sheet is accumulated.
Absorption characterized in that a period during which the actuator holds the moving roller is included so that the moving roller does not move from a predetermined position in the moving direction until the next switching of the feeding operation. For producing a sheet-like member according to a functional article.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 10,
When the loop is made small, the actuator is controlled so that the value related to the tension indicated by the value of the first sensor approaches a prescribed third target value. A method for producing a sheet-like member according to an article.
It is a manufacturing method of the sheet-like member concerning the absorptive article according to claim 10 or 11,
When the actuator moves the moving roller to a position corresponding to the specified length in order to enlarge the loop, a value related to the tension indicated by the value of the first sensor is a specified fourth value. The method of manufacturing a sheet-like member according to an absorbent article, wherein the feeding operation of the other feeding device is performed so as to approach the target value of the absorbent article.
A method for producing a sheet-like member according to any one of claims 10 to 12,
In the case of reducing the loop, the actuator moves the moving roller in the direction by applying a force in the moving direction to the moving roller in a direction in which the loop is reduced.
In the case of enlarging the loop, the actuator moves the moving roller in the direction by applying a force in the moving direction in the direction in which the loop is increased to the moving roller. A method for producing a sheet-like member according to an article.
A method for producing a sheet-like member according to any one of claims 1 to 9,
At least two feeding devices for feeding the second sheet from the sheet roll are provided,
When switching the feeding operation from one feeding device of the two feeding devices to the other feeding device, up to the same value as the feeding speed value of the second sheet in the one feeding device, the other After detecting that the peripheral speed value of the sheet roll supported by the feeding device is accelerated, the second sheet fed from the one feeding device is moved to the second roll of the sheet roll supported by the other feeding device. A method for producing a sheet-like member according to an absorbent article, wherein the second sheet is connected.
A method for producing a sheet-like member according to any one of claims 10 to 14,
When switching the feeding operation from the one feeding device to the other feeding device,
A position corresponding to the predetermined position in the display element of the second sheet of the sheet roll supported by the other feeding device and a predetermined position of the second sheet fed out by the one feeding device. The second sheet fed by the one feeding device is aligned with the second sheet while the positioning is performed so that the amount of deviation in the conveying direction between the two is within ± 5% of the second pitch of the display element. A method for producing a sheet-like member according to an absorbent article, wherein the second sheet of the sheet roll supported by the feeding device is connected.
An apparatus for manufacturing a sheet-like member according to an absorbent article by overlapping and fixing a continuous first sheet and a continuous second sheet while aligning each other's continuous direction,
In the first sheet, a predetermined first pitch is set in correspondence with the absorbent article in the continuous direction of the first sheet,
Before the second sheet is wound up in the continuous direction of the second sheet to be in a sheet roll state, the second sheet is displayed at a second pitch smaller than the first pitch in the continuous direction. Elements are formed,
A feeding device for feeding out the second sheet from the sheet roll;
A delivery device for delivering the second sheet that is fed out and conveyed with the continuous direction as a conveyance direction, to a joining position of a conveyance path of the first sheet;
Three rolls rotatably supported at a fixed position between the feeding device and the feeding device in the transport direction;
In a state where the second sheet is wound around the three rolls, a first value is output according to the force applied from the second sheet to the middle roll of the three rolls. A sensor, and
The feeding device performs a feeding operation of the second sheet from the sheet roll based on the value,
The feeding device is configured to determine the first sheet so that the display elements of the second sheet conveyed in the conveying direction are arranged at the first pitch while feeding the second sheet and based on the first pitch. An apparatus for manufacturing a sheet-like member according to an absorbent article, wherein an extension state of the second sheet in the transport direction is changed so that the display element is positioned at a target position of the display element on the sheet .